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  • 1
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    In-flight lift and drag measurements on a first generation jet transport equipped with winglets (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A KC-135A aircraft equipped with wing tip winglets was flight tested to demonstrate and validate the potential performance gain of the winglet concept as predicted from analytical and wind tunnel data. Flight data were obtained at cruise conditions for Mach numbers of 0.70, 0.75, and 0.80 at a nominal altitude of 36,000 ft. and winglet configurations of 15 deg cant/-4 deg incidence, 0 deg cant/-4 deg incidence, and baseline. For the Mach numbers tested the data show that the addition of winglets did not affect the lifting characteristics of the wing. However, both winglet configurations showed a drag reduction over the baseline configuration, with the best winglet configuration being the 15 deg cant/-4 deg incidence configuration. This drag reduction due to winglets also increased with increasing lift coefficient. It was also shown that a small difference exists between the 15 deg cant/-4 deg incidence flight and wind tunnel predicted data. This difference was attributed to the pillowing of the winglet skins in flight which would decrease the winglet performance.
    Schlagwort(e): AERODYNAMICS
    Materialart: KC-135 Winglet Program Rev.; p 103-116
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  • 2
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    KC-135 winglet program overview (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A joint NASA/USAF program was conducted to accomplish the following objectives: (1) evaluate the benefits that could be achieved from the application of winglets to KC-135 aircraft; and (2) determine the ability of wind tunnel tests and analytical analysis to predict winglet characteristics. The program included wind-tunnel development of a test winglet configuration; analytical predictions of the changes to the aircraft resulting from the application of the test winglet; and finally, flight tests of the developed configuration. Pressure distribution, loads, stability and control, buffet, fuel mileage, and flutter data were obtained to fulfill the objectives of the program.
    Schlagwort(e): AERODYNAMICS
    Materialart: KC-135 Winglet Program Rev.; p 1-46
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  • 3
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    KC-135 wing and winglet flight pressure distributions, loads, and wing deflection results with some wind tunnel comparisons (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A full-scale winglet flight test on a KC-135 airplane with an upper winglet was conducted. Data were taken at Mach numbers from 0.70 to 0.82 at altitudes from 34,000 feet to 39,000 feet at stabilized flight conditions for wing/winglet configurations of basic wing tip, 15/-4 deg, 15/-2 deg, and 0/-4 deg winglet cant/incidence. An analysis of selected pressure distribution and data showed that with the basic wing tip, the flight and wind tunnel wing pressure distribution data showed good agreement. With winglets installed, the effects on the wing pressure distribution were mainly near the tip. Also, the flight and wind tunnel winglet pressure distributions had some significant differences primarily due to the oilcanning in flight. However, in general, the agreement was good. For the winglet cant and incidence configuration presented, the incidence had the largest effect on the winglet pressure distributions. The incremental flight wing deflection data showed that the semispan wind tunnel model did a reasonable job of simulating the aeroelastic effects at the wing tip. The flight loads data showed good agreement with predictions at the design point and also substantiated the predicted structural penalty (load increase) of the 15 deg cant/-2 deg incidence winglet configuration.
    Schlagwort(e): AERODYNAMICS
    Materialart: KC-135 Winglet Program Rev.; p 47-102
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  • 4
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    Shuttle tile environments and loads (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The Shuttle tile ascent environments are discussed and the procedures used to convert these environments into tile loads are outlined. Testing which was performed to quantify or verify the loads are discussed, along with the load combination rationale which was used. The discussion of the ascent environment is limited to the transonic/supersonic portion of the mission since mechanical design loads occur during this time, and to specific regions of the vehicle, in particular those regions in which undensified critical (black) tiles are located.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Shock and Vibration Inform. Center The Shock and Vibration Bull., No. 52. Part 2; p 111-125
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  • 5
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    Structural characteristics of the shuttle orbiter ceramic thermal protection system (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The thermal protection system (TPS) of the Space Shuttle Orbiter is described as well as the results of dynamic reponse studies conducted in support of the efforts to certify the TPS for flight. The ceramic Thermal Protection System consists of ceramic tiles bonded to felt pads which are in turn bonded to the Orbiter substructure to protect the aluminum substructure from the heat of reentry.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Shock and Vibration Inform. Center The Shock and Vibration Bull., No. 52. Part 2; p 101-110
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  • 6
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    Fibrous ceramic insulation (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-04-12
    Beschreibung: Some of the reusable heat shielding materials used to protect the Space Shuttles, their manufacturing processes, properties, and applications are discussed. Emphases is upon ceramic materials. Space Shuttle Orbiter tiles are discussed.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: NASA. Langley Research Center Advan. Mater. Technol.; p 261-274
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  • 7
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    Polymer research at NASA Langley Research Center (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-04-12
    Beschreibung: Polymer synthesis programs involve the development of Novel thermoplastics, pseudothermoplastics, and thermosets. These systems are prepared to elucidate structure-property relationships involving thermal capabilities, toughness, processability and environmental stability. Easily processable polyimides, solvent-resistant polysulfones and polyphenylquinoxalines, and tougher high and intermediate temperature polymers were developed. Characterization efforts included high pressure liquid chromatography methodology, the development of toughness tests for fiber reinforced composites, a study of electrical properties of metal ion filled polyimides, and a study of the mutagenicity of aromatic diamines. Also the mechanism of cure/degradation of experimental polymers was studied by rheology, mechanical behavior, separation techniques and spectroscopy. The degradative crosslinking of alkyl-containing polyimides, the separation and identification of crosslinked phenylquinoxalines, the rheological behavior of hot-melt polyimides, and the elucidation of the cure of norbornene endcapped imides were also studied.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Advan. Mater. Technol.; p 29-48
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  • 8
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    Polymer materials research at NASA Ames Research Center (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-04-12
    Beschreibung: Polymers that provide significant improvements in both efficiency and safety for civilian transport aircraft and military combat aircraft were developed. High strength to weight structures such as carbon fiber composites with long term durability are requirements common to both classes of aircraft. Aircraft safety improvements in fire resistance and crashworthiness of primary and secondary structures are long term objectives for transport aircraft. Void filler ballistic foams, intumescent coatings, and radiation-resistant transparent plastics contribute to vulnerability reduction in combat military aircraft. Low and high velocity impact tolerance, fire resistance, thermal stability, and long term durability of polymers and components are emphasized.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: NASA. Langley Research Center Advan. Mater. Technol.; p 49-64
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  • 9
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    Synthesis of aminosilane and aromatic diamine intermediates for polymerization (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The preparation of monomers for use in a study to improve properties of epoxy polymers and silicone elastomers is described. Various approaches to the solution of the synthesis of aminosilane and diamine curing agents were examined. Ortho-, meta-, and para-substituted diamines where X is CH2, C(CH3)2, O, S, NH, or SO2 and n = 0, 1, 2, and 3 were investigated.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: The 1981 NASA(ASEE Summer Fac. Fellowship Program; 9 p
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  • 10
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    Development of high strength, high temperature ceramics (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Improvement in the high-pressure turbopumps, both fuel and oxidizer, in the Space Shuttle main engine were considered. The operation of these pumps is limited by temperature restrictions of the metallic components used in these pumps. Ceramic materials that retain strength at high temperatures and appear to be promising candidates for use as turbine blades and impellers are discussed. These high strength materials are sensitive to many related processing parameters such as impurities, sintering aids, reaction aids, particle size, processing temperature, and post thermal treatment. The specific objectives of the study were to: (1) identify and define the processing parameters that affect the properties of Si3N4 ceramic materials, (2) design and assembly equipment required for processing high strength ceramics, (3) design and assemble test apparatus for evaluating the high temperature properties of Si3N4, and (4) conduct a research program of manufacturing and evaluating Si3N4 materials as applicable to rocket engine applications.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Alabama Univ. in Huntsville The 1981 NASA(ASEE Summer Fac. Fellowship Program; 11 p
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  • 11
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    Development of toughened epoxy polymers for high performance composite and ablative applications (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A survey of current procedures for the assessment of state of cure in epoxy polymers and for the evaluation of polymer toughness as related to nature of the crosslinking agent was made to facilitate a cause-effect study of the chemical modification of epoxy polymers. Various conformations of sample morphology were examined to identify testing variables and to establish optimum conditions for the selected physical test methods. Dynamic viscoelasticity testing was examined in conjunction with chemical analyses to allow observation of the extent of the curing reaction with size of the crosslinking agent the primary variable. Specifically the aims of the project were twofold: (1) to consider the experimental variables associated with development of "extent of cure" analysis, and (2) to assess methodology of fracture energy determination and to prescribe a meaningful and reproducible procedure. The following is separated into two categories for ease of presentation.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Alabama Univ. in Huntsville The 1981 NASA(ASEE Summer Fac. Fellowship Program; 17 p
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  • 12
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    Polymer matrix composites research at NASA Lewis Research Center (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-04-12
    Beschreibung: The in situ polymerization of monomer reactants (PMR) approach was demonstrated to be a powerful approach for solving many of the processing difficulties associated with the use of high temperature resistant polymers as matrix resins in high performance composites. The PMR-15 polyimide provides the best overall balance of processing characteristics and elevated temperature properties. The excellent properties and commercial availability of composite materials based on PMR-15 led to their acceptance as viable engineering materials. The PMR-15 composites are used to produce a variety of high quality structural components.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: NASA. Langley Research Center Advan. Mater. Technol.; p 65-90
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  • 13
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    Viscous wing code development: A 3-D viscid-inviscid interactive analysis (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center, Theoretical Aerodynamics Contractors' Workshop, Volume 2; p 607-63
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  • 14
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    Computation of separated flow on airfoils with the Grumfoil code (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center, Theoretical Aerodynamics Contractors' Workshop, Volume 2; p 557-58
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  • 15
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    Analysis of airfoil transitional separation bubbles (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center, Theoretical Aerodynamics Contractors' Workshop, Volume 2; p 539-55
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  • 16
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    Entropy effects and shock fitting in conical supersonic full potential flows (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center, Theoretical Aerodynamics Contractors' Workshop, Volume 2; p 461-49
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  • 17
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    Corrosion protection coating (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: NASA Technol. Appl. Team; p 40
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  • 18
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    Ion beam deposition of amorphous carbon films with diamond like properties (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: Carbon films were deposited on silicon, quartz, and potassium bromide substrates from an ion beam. Growth rates were approximately 0.3 micron/hour. The films were featureless and amorphous and contained only carbon and hydrogen in significant amounts. The density and carbon/hydrogen ratio indicate the film is a hydrogen deficient polymer. One possible structure, consistent with the data, is a random network of methylene linkages and tetrahedrally coordinated carbon atoms.
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 19
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    Surface crystallization of a fluoride glass (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: Growth of crystals on the surface of a Zr-Ba-La fluoride glass was observed by optical and scanning electron microscopy. Small, dark crystal nucleated rapidly and grew to a size of about 10 microns; then they stopped growing, and wrinkled regions emerged, covering the entire crystal surface.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: American Ceramic Society, Communications (ISSN 0002-7820); 66; C-132
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  • 20
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    Thermal oxidative degradation reactions of linear perfluoroalkyl ethers (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Thermal and thermal oxidative stability studies were performed on linear perfluoroalkyl ether fluids. The effect on degradation by metal catalysts and degradation inhibitors is reported. The linear perfluoroalkyl ethers are inherently unstable at 316 C in an oxidizing atmosphere. The metal catalysts greatly increased the rate of degradation in oxidizing atmospheres. In the presence of these metals in an oxidizing atmosphere, the degradation inhibitors were highly effective in arresting degradation at 288 C. However, the inhibitors had only limited effectiveness at 316 C. The metals promote degradation by chain scission. Based on elemental analysis and oxygen consumption data, the linear perfluoroalkyl ether fluids have a structural arrangement based on difluoroformyl and tetrafluoroethylene oxide units, with the former predominating. Previously announced in STAR as N82-26468
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: I&EC - Industrial and Engineering Chemistry, Product Research and Development (ISSN 0196-4321); 22; 166-170
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  • 21
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    Fracture mechanics of cellular glass (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The fracture mechanics of cellular glasses (for the structural substrate of mirrored glass for solar concentrator reflecting panels) are discussed. Commercial and developmental cellular glasses were tested and analyzed using standard testing techniques and models developed from linear fracture mechanics. Two models describing the fracture behavior of these materials were developed. Slow crack growth behavior in cellular glass was found to be more complex than that encountered in dense glasses or ceramics. The crack velocity was found to be strongly dependent upon water vapor transport to the tip of the moving crack. The existence of a static fatigue limit was not conclusively established, however, it is speculated that slow crack growth behavior in Region 1 may be slower, by orders of magnitude, than that found in dense glasses. Previously announced in STAR as N82-11209
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 22
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    Simulated space radiation effects on dielectrics and coatings (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Simulation tests of space radiation have been performed for specific organic and inorganic materials. The test results for fifteen materials exposed to protons and five exposed to electrons are presented.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-30; 4090-409
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  • 23
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    The effect of annealing on the creep of plasma-sprayed ceramics (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The creep of plasma sprayed ZrO2-8Y2O3 was measured at temperatures from 98 to 1250 C (180 to 220 F), and compared to creep of identical samples after annealing at temperatures from 98 to 1316 C (1800 to 2400 F). Loads and temperatures which produced significant creep of as sprayed ceramics produced no creep after annealing. Previously announced in STAR as N83-24799
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 819-827
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  • 24
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    Residual stress in plasma-sprayed ceramic turbine tip and gas-path seal specimens (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The residual stresses in a ceramic sheet material used for turbine blade tip gas path seals, were estimated. These stresses result from the plasma spraying process which leaves the surface of the sheet in tension. To determine the properties of plasma sprayed ZrO2-Y2O3 sheet material, its load deflection characteristics were measured. Estimates of the mechanical properties for sheet materials were found to differ from those reported for plasma sprayed bulk materials. Previously announced in STAR as N83-28380
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 802-809
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  • 25
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    Correlation of compressive and shear stress with spalling of plasma-sprayed ceramic materials (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Ceramics on metal substrates for potential use as high temperature seals or other applications are exposed to forces originating from differences in thermal expansion between the ceramic and the metal substrate. This report develops a relationship between the difference in expansion of the ceramic and the substrate, defines conditions under which shear between the ceramic and the substrate occurs, and those under which bending forces are produced in the ceramic. The off-axis effect of compression forces resulting from high temperature plastic flow of the ceramic producing buckling of the ceramic is developed. Shear is associated with the edge or boundary stresses on the component while bending is associated with the distortion of an interior region. Both modes are significant in predicting life of the ceramic. Previously announced in STAR as N83-27016
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 810-818
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  • 26
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    An exploratory study of area-efficient vortex flap concepts (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The potential of planform modification and hinge-line relocation to improve the thrust efficiency of vortex flaps was experimentally investigated on a 60-deg cropped delta wing model. Spanwise segmentation of the flap, together with chord-tailoring of the segments, allowed the vortex to be maintained on the outboard flap surfaces to higher angles of attack. In addition, location of the flap hinge aft of and underneath the wing leading edge generated substantial thrust from the vortex suction acting on the leading-edge lower surface. A combination of these beneficial effects allowed the flap/wing area to be reduced from 11.4 percent of the continuous flap to 6.3 percent of segmented flap, essentially without detriment to the incremental lift-to-drag ratio due to flap addition in the lift coefficient range 0.5-0.7 based on the basic wing area.
    Schlagwort(e): AERODYNAMICS
    Materialart: Journal of Aircraft (ISSN 0021-8669); 20; 1062-106
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  • 27
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    Observations and implications of natural laminar flow on practical airplane surfaces (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 20, p. 3138, Accession no. A82-40893
    Schlagwort(e): AERODYNAMICS
    Materialart: Journal of Aircraft (ISSN 0021-8669); 20; 993-1006
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  • 28
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    Ultrasonic mixing of epoxy curing agents (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A new technique for mixing solid curing agents into liquid epoxy resins using ultrasonic energy was developed. This procedure allows standard curing agents such as 4,4 prime-diaminodiphenyl sulfone (4,4 prime-DDS) and its 3,3 prime-isomer, (3,3 prime-DDS) to be mixed without prior melting of the curing agent. It also allows curing agents with very high melt temperatures such as 4,4 prime-diaminodiphenyl sulfone (4,4 prime-DDS) and its 3,3 prime-isomer, (3,3 prime-DDS) to be mixed without prior melting of the curing agent. It also allows curing agents with very high melt temperatures such as 4,4 prime-diaminobenzophenone (4,4 prime-DABP) (242 C) to be mixed without premature curing. Four aromatic diamines were ultrasonically blended into MY-720 epoxy resin. These were 4, 4 prime-DDS; 3,3 prime-DDA; 4, 4 prime-DABP and 3,3 prime-DABP. Unfilled moldings were cast and cured for each system and their physical and mechanical properties compared. Previously announced in STAR as N83-27018
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: SAMPE Quarterly (ISSN 0036-0821); 14; 46-50
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  • 29
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    Hardness of dense beta-Si3N4 (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The effects of small changes in the concentration of an oxygen content densification aid on the room temperature microhardness of hot isostatically pressed and sintered beta-Si3N4 ceramics are studied. The compositions studied were Si3N4 containing 7 wt. pct BeSiN2, a fixed nonoxide densification aid, and 1.9-3.7 wt. pct oxygen as a second, variable densification aid. A proportional relationship between high density and high oxygen content, regardless of heat treatment type, is noted.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Materials Science Letters (ISSN 0261-8028); 2; 657-659
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  • 30
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    Stability of shock waves attached to wedges and cones (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 06, p. 799, Accession no. A82-17876
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal (ISSN 0001-1452); 21; 1611-161
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  • 31
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    Stability of silica heat shield materials in the Space Shuttle environment (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Sample tiles of Space Shuttle reusable surface insulation (RSI) and fibrous refractory composite insulation (FRCI) have been alternately exposed to simulated mission heating and the Kennedy Space Center launch-pad environment for up to 50 cycles. The two types of tiles were coated with an identical glass composition. The coating on RSI tiles was prone to cracking in the test environment while the same coating on FRCI was not. Absorption of water contaminated with environmental deposits resulted in accelerated devitrification in the RSI tiles. Devitrification in FRCI tiles was significantly less. The rate of environmental degradation of tiles appeared to be dependent on the amount of water absorption.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 564-577
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  • 32
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    Surface chemistry, friction, and wear of Ni-Zn and Mn-Zn ferrites in contact with metals (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: X-ray photoelectron and Auger electron spectroscopy analysis were used in sliding friction experiments. These experiments were conducted with hot-pressed polycrystalline Ni-Zn and Mn-Zn ferrites, and single-crystal Mn-Zn ferrite in contact with various transition metals at room temperature in both vacuum and argon. The results indicate that Ni2O3 and Fe3O4 were present on the Ni-Zn ferrite surface in addition to the nominal bulk constituents, while MnO2 and Fe3O4 were present on the Mn-Zn ferrite surface in addition to the nominal bulk constituents. The coefficients of friction for the ferrites in contact with metals were related to the relative chemical activity of these metals. The more active the metal, the higher is the coefficient of friction. The coefficients of friction for the ferrites were correlated with the free energy of formation of the lowest metal oxide. The interfacial bond can be regarded as a chemical bond between the metal atoms and the oxygen anions in the ferrite surfaces. The adsorption of oxygen on clean metal and ferrite does strengthen the metal-ferrite contact and increase the friction. The ferrites exhibit local cracking and fracture with sliding under adhesive conditions. All the metals transferred to the surfaces of the ferrites in sliding. Previously announced in STAR as N83-19901
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 674-693
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  • 33
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    Shrinkage of amorphous silica fibers (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: By the application of a new technique, the viscosity of amorphous silica fibers was determined in the 1100-1350 C temperature range. An equation was derived that describes the kinetics of shrinkage of the fibers in terms of their radius, viscosity, and surface tension.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 492-501
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  • 34
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    Phase distributions in plasma-sprayed zirconia-yttria (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The distribution of phases in plasma-sprayed zirconia-yttria has been determined over a range of yttria levels from 0 to 26.1 molpct YO(1.5) using room temperature X-ray diffractometry. Pure, plasma-sprayed zirconia is composed almost entirely of the monoclinic phase. At levels of yttria between 4 and 10 percent, a quenched-in tetragonal phase predominates, and at higher levels the cubic phase predominates. The phase distributions are compared with previously reported test lives of thermal barrier coatings formed from these materials. Regions of optimal lives were found to correlate with regions having high amounts of the tetragonal phase, small but nonzero amounts of the monoclinic phase, and little or none of the cubic phase. Possible relationships between phase composition and coating performance are discussed.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: American Ceramic Society Bulletin (ISSN 0002-7812); 62; 1355-135
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  • 35
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    Development of plane strain fracture toughness test for ceramics using Chevron notched specimens (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Chevron-notched four-point-bend and short-bar specimens have been used to determine the fracture toughness of sintered aluminum oxide and hot-pressed silicon nitride ceramics. The fracture toughness for Si3N4 is found to be essentially independent of the specimen size and chevron notch configuration, with values ranging from 4.6 to 4.9 MNm exp -3/2. In contrast, significant specimen size and notch geometry effects have been observed for Al2O3, with the fracture toughness ranging from 3.1 to 4.7 MNm exp -3/2. These effects are attributed to a rising crack growth resistance curve for the Al2O3 tested.
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 36
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    A chimera grid scheme (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A mesh system composed of multiple overset body-conforming grids is described for adapting finite-difference procedures to complex aircraft configurations. In this so-called 'chimera mesh,' a major grid is generated about a main component of the configuration and overset minor grids are used to resolve all other features. Methods for connecting overset multiple grids and modifications of flow-simulation algorithms are discussed. Computational tests in two dimensions indicate that the use of multiple overset grids can simplify the task of grid generation without an adverse effect on flow-field algorithms and computer code complexity.
    Schlagwort(e): AERODYNAMICS
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  • 37
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    Microstructural characterization of SiC (SCS) filaments (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Microstructural features of SiC('SCS') fibers demonstrating growth properties have been investigated using scanning and transmission electron microscopy. An etchant of fused KOH:KNO3 was developed which adequately brought out previously undetermined features.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: SAMPE Quarterly (ISSN 0036-0821); 14; 39-45
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  • 38
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    Conservative full-potential calculations for axisymmetric, transonic flow (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 17, p. 2873, Accession no. A81-38082
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal (ISSN 0001-1452); 21; 1492-149
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  • 39
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    Morphological and frictional behavior of sputtered MoS2 films (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously announced in STAR as N82-22387)
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 40
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    Turbulence amplification in shock-wave boundary-layer interaction (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Attention is directed to the acoustics research of the 1950s and 1960s for guidance in understanding and quantizing the turbulence amplification that can occur in regions of shock-wave boundary-layer interaction. Three primary turbulence amplifier-generator mechanisms are identified and shown, by linear analysis, to be responsible for turbulence amplification across a shock wave in excess of 100% of the incident turbulence intensity.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal; 20; July 198
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  • 41
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    SPF/DB titanium concepts for structural efficiency foi HC (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Illustrations for a presentation on superplastic forming/diffusion bonding titanium design concepts are presented. Sandwich skin panels with hat section, semicircular corrugation, sine wave, and truss cores are shown. The fabrication of wing panels is illustrated, and applications to the design of advanced variable sweep bombers summarized.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center Laminar Flow Control; p 95-110
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  • 42
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    SPF/DB titanium LFC porous panel concept (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Illustrations for a presentation demonstrating superplastic forming/diffusion bonding titanium porous panels are presented. Fabrication phases, sandwich panels, load bearing qualities, microstructure, and panel surface after finishing are illustrated.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center Laminar Flow Control; p 111-138
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  • 43
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    X-29A forward-swept-wing demonstrator airplane (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The X-29A is a technology demonstrator. The FSW is just one of the technologies. Others include the following: discrete variable camber, relaxed static stability, triplex digital fly-by-wire (FBW) control system, variable-incidence/close-coupled canard, aeroelastically tailored composite wing, and thin supercritical airfoil. The growth potential for additional technologies is shown.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center Wind-Tunnel(Flight Correlation, 1981; p 177-189
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  • 44
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    Opportunities for wind-tunnel/flight correlation with new Boeing airplanes (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The use of correlated data in airplane development is discussed. Areas of interest include initial airworthiness of an aircraft, low-speed configuration optimization, and high-speed configuration optimization. Data from wind tunnel tests are shown to be significant when applied to guarantee compliance, which includes fuel consumption, airspeeds, and takeoff and landing performance. The use of correlation in achieving FAA certification is also discussed.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center Wind-Tunnel-Flight Correlation, 1981; p 141-157
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  • 45
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    F-15 wind-tunnel/flight correlations (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: F-15 correlation data for longitudinal control and inlet-ramp effectiveness, and horizontal-tail setting for trim are presented. The Reynolds number effect on airfoil laminar bubble burst is included.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center Wind-Tunnel(Flight Correlation, 1981; p 109-115
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  • 46
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    Wind-tunnel/flight correlation program on XB-70-1 (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The XB-70-1 was selected for a wind-tunnel/flight correlation program as representative of a large, flexible supersonic airplane similar to a supersonic transport. Tests were made to determine the effects of control deflections, wing tip deflection, and variations in inlet mass flow (additive drag).
    Schlagwort(e): AERODYNAMICS
    Materialart: Wind-Tunnel(Flight Correlation, 1981; p 65-91
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  • 47
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    X-29A for NTF wind-tunnel/flight correlations (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Considerations and recommendations for correlation are given. Basic tunnel calibration prior to research and development tests is suggested. Areas of concentration include: wing cruise drag and drag rise, wing separation and stall, afterbody and base drag, propulsion effects, vortex flows, cavity flows, and excrescences.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center Wind-Tunnel(Flight Correlation, 1981; p 191-197
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  • 48
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    Space-vehicle correlation of ground and flight experiments (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A 2-percent-scale model was designed for testing in the NTF. This model has remotely controlled elevons, body flap, and rudder to minimize tunnel entries associated with configuration changes in the NTF. The Shuttle Orbiter has a very large aerodynamic data base obtained in ground facilities. Since the vehicle flight-test program has already begun, a large amount of flight data can be analyzed and correlated with the NTF results.
    Schlagwort(e): AERODYNAMICS
    Materialart: Wind-Tunnel(Flight Correlation, 1981; p 173-176
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  • 49
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    Aerodynamic comparisons of Space Shuttle ascent: STS-1 flight versus wind-tunnel predictions (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: It is found from the comparisons that large longitudinal aerodynamic differences exist between wind tunnel predictions and flight measurements. Cold gas plume simulation underpredicted Shuttle base pressure. It is concluded that observed flight prediction increments are probably caused by several factors such as input error, independent variable errors, plume effects, and Reynolds number effects.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center Wind-Tunnel(Flight Correlation, 1981; p 133-140
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  • 50
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    Problems in correlation caused by propulsion systems (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Correlation efforts and selected results for transonic drag are reviewed. A process to reduce the typical error sources to decrease the errors inherent in the transonic aircraft development process is summarized.
    Schlagwort(e): AERODYNAMICS
    Materialart: Wind-Tunnel(Flight Correlation, 1981; p 93-108
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  • 51
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    Wind-tunnel/flight-drag correlation (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Predicted and flight-test drag on the C-5A and the C-141 are correlated. Equivalent rigid flight-test profile drag and a rigid estimate based on wind tunnel data are also correlated. Correlations for the National Transonic Facility are included.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center Wind-Tunnel(Flight Correlation, 1981; p 33-46
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  • 52
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    Review of the 1980 Wind-Tunnel/Flight Correlation Panel (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Wind tunnel/flight correlation history from the P-51 to the F-8 supercritical wing is reviewed, showing that researchers continue to be faced with nearly identical discrepancies in predicted versus measured drag. The capabilities of the National Transonic Facility to allow assessment of the effects which have heretofore plagued researchers and aircraft designers are anticipated.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center Wind-Tunnel(Flight Correlation, 1981; p 23-32
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  • 53
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    Transonic-flow computation using an explicit-implicit method (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The explicit-implicit predictor corrector method of MacCormack (1981) is applied to the analysis of flows past airfoils. By comparing results obtained with different methods and meshes, it is shown that the above method provides, after certain modifications, reasonably good predictions of inviscid and viscous flows about an airfoil. Good results are also obtained for the transonic regime if the free-stream conditions are correct and if a suitable mesh is used.
    Schlagwort(e): AERODYNAMICS
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  • 54
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    Study of molecular deformation mechanisms in the glassy state. I - Temperature effect on stress-birefringence and strain-birefringence responses of poly(methyl methacrylate) (1983)
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    Publikationsdatum: 2011-08-18
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Polymer Science: Polymer Physics Edition (ISSN 0098-1273); 21; 1647-166
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  • 55
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    Electrically conductive black optical paint (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: An electrically conductive flat black paint has been developed for use on the Galileo spacecraft which will orbit Jupiter in the late 1980s. The paint, designed for equipment operating in high-energy radiation fields, has multipurpose functions. Its electrical conductivity keeps differential charging of the spacecraft external surfaces and equipment to a minimum, preventing the buildup of electrostatic fields and arcing. Its flat black aspect minimizes the effects of stray light and unwanted reflectances, when used in optical instruments and on sunshades. Its blackness is suitable, also, for thermal control, when the paint is put on spacecraft surfaces. The paint has good adherence properties, as measured by tape tests, when applied properly to a surface. The electrically conductive paint which was developed has the following characteristics: an electrical resistivity of 5 x 10 to the 7th ohms per square; a visual light total reflectance of approximately 5 percent; an infrared reflectance of 0.13 measured over a spectrum from 10 to the (-5.5) power to 0.001 meter; a solar absorptivity, alpha-s, of 0.93, and a thermal emissivity, epsilon, of 0.87, resulting in an alpha-s/epsilon of 1.07. The formula for making the paint and the process for applying it are described.
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 56
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    Characteristics of Si3N4-SiO2-Ce2O3 compositions sintered in high-pressure nitrogen (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Full-density Si3N4-SiO2-Ce2O3 compositions were prepared by sintering with 2.5 MPa nitrogen pressure at temperatures of 1900 and 2090 C. Room-temperature flexural strengths near 700 MPa for sintered material compared favorably with the strength of hot-pressed material. At 1370 C, where flexural strengths as high as 363 MPa were obtained, it was observed that the coarsest structure was the strongest and the finest structure was the weakest. One of the compositions tested, Si3N4-8.7 wt pct SiO2-8.3 wt pct-Ce2O3, was found to have excellent 200-h oxidation resistance at 700, 1000, and 1370 C, without incidence of 700 to 1000 C phase instability and cracking.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: American Ceramic Society, Journal (ISSN 0002-7820); 66; 835-841
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  • 57
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    Performance of laser-glazed zirconia thermal barrier coatings in cyclic oxidation and corrosion burner rig tests (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously announced in STAR as N82-22346)
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 58
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    Some properties of r.f.-sputtered hafnium nitride coatings (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously announced in STAR as N82-21331)
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 59
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    Sputtered silicon nitride coatings for wear protection (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously announced in STAR as N82-20314)
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 60
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    On the impingement of supersonic jet on a normal flat surface (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: An improved method, based on one strip approximation of the method of integral relations which was reported originally by Belov, Ginzburg and Shub (1973), is presented for the calculation of flow parameters in the impingement region of a supersonic, underexpanded jet striking a normal surface located within the first cell. The results are presented for two impingement conditions and found to be in good agreement with the experimental data.
    Schlagwort(e): AERODYNAMICS
    Materialart: Aeronautical Quarterly; 33; Aug. 198
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  • 61
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    The combined effects of Fe and H2 on the nitridation of silicon (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: In view of the support offered by previous work for the suggestion that Fe may affect alpha-Si3N4 formation and microstructural development, a two-part study was conducted to differentiate the effects of H2 and Fe in, first, the nitridation of pure and of Fe-containing powder in N2 and N2-4% H2, and then the nitridation of (1 1 1) Si single crystal wafers with and without Fe powder on the surface. The degree of nitridation is most strongly affected by H2 at 1200 C, but by Fe at 1375 C, where Fe-containing samples in either atmosphere were almost completely nitrided. While neither H2 nor Fe alone changed the ratio of alpha-Si3N4 to beta-Si3N4, the combination of H2 and Fe increased it at both temperatures.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Materials Science Letters; 1; Aug. 198
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  • 62
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    Experimental studies of the vapor phase nucleation of refractory compounds. I - The condensation of SiO (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The critical partial pressure of SiO necessary to initiate avalanche nucleation in the SiO-H2 system is measured as a function of the ambient temperature in the range 750-1000 K. Results show that the condensate produced at low temperatures is Si2O3, while a mixture of Si2O3 and amorphous SiO2 is produced at high temperatures. A surface energy of approximately 500 ergs/sq cm for the particles is found by analyzing the critical partial pressure vs temperature using classical nucleation theory. It is concluded that classical nucleation theory is not applicable to this system, because several inconsistencies in the thermodynamic analysis are demonstrated, and it is suggested that a kinetic theory of nucleation may be the preferential way to describe the condensation process.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Chemical Physics; 77; Sept. 1
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  • 63
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    Pressure distributions and shock shapes for a bent-nose biconic at incidence (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Initial results of a NASA study of the lift-drag characteristics of a 12.84/7 deg biconic model intended for airbraking during atmospheric entry of probes to Mars, Venus, Saturn, and Titan are reported. Pressure distributions and shock shapes were measured in the Langley 20 in. Mach 6 tunnel with the spherically blunted bent-nose model set at angles from 0-25 deg. Pressure distributions and shock shapes where computed using the STEIN flowfield code, which features a MacCormack scheme to integrate the three-dimensional Euler equations, the Rankine-Hugoniot jump conditions to model shock waves as discontinuities, and requires a supersonic condition at every step. A comparison was made between measured and predicted values. The leeward shock angle was found to be predictable to within 3% for all angles of attack, while parabolized Navier-Stokes equations are regarded as offering more accurate results than the STEIN code for surface pressure distributions.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal; 20; Aug. 198
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  • 64
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    Chordwise and compressibility corrections for arbitrary planform slender wings (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The Lomax and Sluder method for adapting slender-wing theory to delta or rectangular wings by making chordwise and compressibility corrections is extended to cover wings of any arbitrary planform in subsonic and supersonic flows. The numerical accuracy of the present work is better than that of the Lomax-Sluder results. Comparison of the results of this work with those of the vortex-lattice method and Kernel function method for a family of Gothic and arrowhead wings shows good agreement. A universal curve is proposed for the evaluation of the lift coefficient of a low aspect ratio wing of an arbitrary planform in subsonic flow. The location of the center of pressure can also be estimated.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal; 20; Aug. 198
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  • 65
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    Numerical investigation of turbulent channel flow (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously announced in STAR as N81-30385)
    Schlagwort(e): AERODYNAMICS
    Materialart: Journal of Fluid Mechanics; 118; May 1982
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  • 66
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    Wind-tunnel wall interference corrections for three-dimensional flows (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: A procedure for the evaluation of wall interference corrections for three-dimensional aircraft configurations is presented. The Mach number and angle-of-attack corrections are obtained by numerically solving the Laplace equation in a parallelepiped with boundary conditions supplied mainly from experimental pressure measurements. A portion of these measurements and other wind-tunnel data required by the procedure may be replaced by theoretical estimates if not available from experiments. The accuracy of the correction results will then depend on the accuracy of these estimates. The correction procedure is applied to an isolated wing and to a wing-tail configuration in a solid-wall wind tunnel. It is found that neglecting twist and camber corrections for the wing effectively increases the tail angle-of-attack correction. Two different Mach number corrections can be calculated for the wing and tail. However, since only one Mach number correction is allowed for both the wing and the tail, and since the wing surface area is larger than the tail surface area, the final correction tends to be closer to the required wing correction. This is a source of error for the tail results.
    Schlagwort(e): AERODYNAMICS
    Materialart: Journal of Aircraft; 19; June 198
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  • 67
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    Validation of LTRAN2-HI by comparison with unsteady transonic experiment (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously announced in STAR as N81-29092)
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal; 20; May 1982
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  • 68
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    Compliance calibration of the short rod chevron-notch specimen for fracture toughness testing of brittle materials (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The short rod chevron-notch specimen has the advantages of (1) crack development at the chevron tip during the early stage of test loading, and (2) convenient calculation of plane-strain fracture toughness from the maximum test load and from a calibration factor which depends only on the specimen geometry and manner of loading. For generalized application, calibration of the specimen over a range of specimen proportions and chevron-notch configurations is necessary. Such was the objective of this investigation, wherein calibration of the short rod specimen was made by means of experimental compliance measurements converted into dimensionless stress intensity factor coefficients.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: International Journal of Fracture; 18; Feb. 198
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  • 69
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    Dynamics of solid dispersions in oil during the lubrication of point contacts. II - Molybdenum disulfide (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously announced in STAR as N81-20275)
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 70
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    Test methodology for evaluation of fireworthy aircraft seat cushions (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Aircraft seat materials were evaluated in terms of their thermal performance. The materials were evaluated using (a) thermogravimetric analysis, (b) differential scanning calorimetry, (c) a modified NBS smoke chamber to determine the rate of mass loss and (d) the NASA T-3 apparatus to determine the thermal efficiency. In this paper, the modified NBS smoke chamber will be described in detail since it provided the most conclusive results. The NBS smoke chamber was modified to measure the weight loss of materials when exposed to a radiant heat source over the range of 2.5 to 7.5 W/cm sq. This chamber has been utilized to evaluate the thermal performance of various heat blocking layers utilized to protect the polyurethane cushioning foam used in aircraft seats. Various kinds of heat blocking layers were evaluated by monitoring the weight loss of miniature seat cushions when exposed to the radiant heat. The effectiveness of aluminized heat blocking systems was demonstrated when compared to conventional heat blocking layers such as neoprene. All heat blocking systems showed good fire protection capabilities when compared to the state-of-the-art, i.e., wool-nylon over polyurethane foam.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Fire and Flammability; 13; Jan. 198
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  • 71
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    Large scale model measurements of airframe noise using cross-correlation techniques (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Cross-correlation techniques are used to measure the sound radiated by wing/flap airfoil configurations in the NASA-Ames 40 x 80 ft wind tunnel using a 6.7-m semispan model with three deployed flaps. The dominant source of flap noise is identified as the flap side edges, which exceeds that radiated by the midspan region by more than 10 dB. The turbulent surface eddies at the flap side edge have scales on the order of one-half the flap chord. The installation of flap actuator fairings at the flap side edge reduces the noise radiated from that location by 10 to 15 dB. The cross-correlation technique extracts airframe noise radiated by specific surface locations from the tunnel background noise, even when the noise is 25 dB higher than the measured airframe noise level.
    Schlagwort(e): AERODYNAMICS
    Materialart: Acoustical Society of America; vol. 71
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  • 72
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    Microstructure and property characterization of sintered Si3N4, SiC, and SiAlON (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Commercially-produced, pressureless sintered Si3N4, SiC, and SiAlON were characterized with respect to density, phases present, bend strength, and oxidation resistance. The room-temperature bend strengths of sintered Si3N4, SiC, and SiAlON are comparable. However, the room-temperature strengths are much lower (approximately 40 to 50%) than the room-temperature strength of hot-pressed Si3N4 (NC-132). The strength loss in Si3N4 and SiAlON materials at high temperature was attributed to a viscous grain-boundary phase, retained during cooling from the sintering temperature. The oxidation resistance of sintered alpha-SiC was the best of any materials tested.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: American Ceramic Society; vol. 65
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  • 73
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    Molecular deformation and stress-strain behavior of poly(bisphenol-A-diphenyl sulfone) (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The strain-birefringence response of poly(bisphenol-A-diphenyl sulfone) is found to be independent of temperature at temperatures below -100 C; at higher temperatures, the response becomes slightly dependent on temperature, with lower birefringence seen at higher temperatures. The stress-strain behavior and the stress-birefringence response both depend on temperature over the entire testing temperature range (-179 C to 150 C) studied; this dependence, however, is not pronounced. The evidence is seen as suggesting that the polymer molecules respond to deformation by undergoing conformational rearrangements; the mode of the molecular deformation remains unchanged for temperatures of -100 C or lower. At higher temperatures, the average length of the chain segments involved in the rearrangement increases. The stress-strain response is attributed mainly to chain orientation. The entropic contribution deriving from chain orientation at temperatures below -100 C is still substantial. The modest temperature dependence of the stress-strain response suggests that the energy barriers for the chain segments involved in the rearrangement are relatively low.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Applied Physics (ISSN 0021-8979); 54; Oct. 198
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  • 74
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    Photothermal degradation of ethylene/vinylacetate copolymer (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Photothermal degradation studies were conducted on a 'stabilized' formulation of ethylene/vinyl acetate copolymer (EVA) in the temperature range 25-105 C under three different oxygen environments (in open air, with limited access to O2, and in a dark closed stagnant oven). These studies were performed in order to evaluate the utility of EVA as an encapsulation material for photovoltaic modules. Results showed that at low temperature (25 C), slow photooxidation of the polymer occurred via electronic energy transfer involving the UV absorber incorporated in the polymer. However, no changes in the physical properties of the bulk polymer were detected up to 1500 hours of irradiation. At elevated temperatures, leaching and evaporation of the additives occurred, which ultimately resulted in the chemical crosslinking of the copolymer and the formation of volatile photoproducts such as acetic acid.
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 75
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    Topological analysis of computed three-dimensional viscous flow fields (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Computed solutions of the time-dependent, Reynolds-averaged Navier-Stokes equations for three-dimensional flows having thin shear layers are analyzed, using topological concepts. Specific examples include the transonic flow over a body of revolution with conical afterbody at moderate angles of incidence to the free stream. Experimental flow-visualization techniques are simulated graphically to visualize the computed flow. Scalar and vector fluid dynamic properties, such as pressure, shear stress, and vorticity on the body surface, are presented as topological maps, and their relationship to one another in terms of orientation and singular points is discussed. The extrapolation from these surface topologies toward the understanding of external flow-field behavior is discussed and demonstrated.
    Schlagwort(e): AERODYNAMICS
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  • 76
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    The structure of boron in boron fibres (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The structure of noncrystalline, chemically vapour-deposited boron fibres was investigated by computer modelling the experimentally obtained X-ray diffraction patterns. The diffraction patterns from the models were computed using the Debye scattering equation. The modelling was done utilizing the minimum nearest-neighbour distance, the density of the model, and the broadening and relative intensity of the various peaks as boundary conditions. The results suggest that the fibres consist of a continuous network of randomly oriented regions of local atomic order, about 2 nm in diameter, containing boron atoms arranged in icosahedra. Approximately half of these regions have a tetragonal structure and the remaining half a distorted rhombohedral structure. The model also indicates the presence of many partial icosahedra and loose atoms not associated with any icosahedra. The partial icosahedra and loose atoms indicated in the present model are in agreement with the relaxing sub-units which have been suggested to explain the anelastic behavior of fibre boron and the loosely bound boron atoms which have been postulated to explain the strengthening mechanism in boron fibres during thermal treatment.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Materials Science (ISSN 0022-2461); 18; Sept
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  • 77
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    A new brominated polymeric additive for flame retardant glass-filled polybutylene terephthalate (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Attention is called to the undesirable effects (poor ultraviolet light stability and blooming) sometimes introduced by brominated flame retarders. A brominated polymeric additive (BPA) with little or none of these undesirable side effects is compared with decabromobiphenyl oxide (DBBPO). The additive bears the product name F-2300. It is found to be more easily dispersed than DBBPO. The F-2300 is as effective as the DBBPO in the oxygen index test. The improved efficiency of the F-2300 may be explained by its better dispersion in polybutylene terephthalate (PBT). Glass-filled PBT containing F-2300 is found to be more resistant to UV degradation than DBBPO-containing formulas. Formulations with F-2300 therefore have a longer useful outdoor life. F-2300 is a diglycidyl-type polymer containing 50 percent aromatically bound bromine. Its melting point is 112 C, and it is stable up to 372 C. It is pointed out that since its melts at a relatively low temperature, it can be introduced into the formulation as a large agglomerate and still be dispersed evenly throughout the polymer.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Fire Retardant Chemistry; 9; Aug. 198
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  • 78
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    Injection slot location for boundary-layer control in shock-induced separation (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 18, p. 726, Accession no. A78-41866
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0021-8669)
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  • 79
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    Lower-curing-temperature PMR polyimides (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Partial substitution of a p-aminostyrene end-cap for the monomethyl ester of 5-norbornene-2, 3-dicarboxylic acid lowered the final cure temperature of typical PMR resins from 600 F to 500 F. The weight loss characteristics of neat resins and graphite fiber composites prepared by using the mixed end-cap approach were determined at 600 F. The room temperature and short-time elevated temperature mechanical properties of the composites at 550 F and 600 F were determined. The mechanical property retention characteristics of the composites at 550 F and 600 F are discussed. Previously announced in STAR as N83-10118
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Polymer Composites (ISSN 0272-8397); 4; July 198
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  • 80
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    Dynamic fatigue of a machinable glass-ceramic (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: To assess the stress-corrosion susceptibility of a machinable glass-ceramic, its dynamic fatigue behavior was investigated by measuring its strength as a function of stress rate. Fracture mechanics techniques were used to analyze the results for the purpose of making lifetime predictions for components of this material. This material was concluded to have only moderate resistance (N = 30) to stress corrosion in ambient conditions. The effects of specimen size on strength were assessed for the material used in this study; it was concluded that the Weibull edge-flaw scaling law adequately describes the observed strength-size relation.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: (ISSN 0002-7820)
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  • 81
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    Experimental determination of vapor species from laser-ablated carbon phenolic composites (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previosuly cited in issue 17, p. 2910, Accession no. A81-39069
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: (ISSN 0001-1452)
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  • 82
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    XPS, AES and friction studies of single-crystal silicon carbide (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The surface chemistry and friction behavior of a single crystal silicon carbide surface parallel to the 0001 plane in sliding contact with iron at various temperatures to 1500 C in a vacuum of 3 x 10 nPa are investigated using X-ray photoelectron and Auger electron spectroscopy. Results show that graphite and carbide-type carbon are seen primarily on the silicon carbide surface in addition to silicon at temperatures to 800 C by both types of spectroscopy. The coefficients of friction for iron sliding against a silicon carbide surface parallel to the 0001 plane surface are found to be high at temperatures up to 800 C, with the silicon and carbide-type carbon at maximum intensity in the X-ray photoelectron spectroscopy at 800 C. The concentration of the graphite increases rapidly on the surface as the temperature is increased above 800 C, while the concentrations of the carbide-type carbon and silicon decrease rapidly and this presence of graphite is accompanied by a significant decrease in friction. Preheating the surfaces to 1500 C also gives dramatically lower coefficients of friction when reheating in the sliding temperature range of from room temperature to 1200 C, with this reduction in friction due to the graphite layer on the silicon carbide surface.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Applications of Surface Science (ISSN 0378-5963); 10; 1982
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  • 83
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    Surface analyses of carbon fibers produced from polyacrylonitrile fibers at low carbonization temperatures (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: A process for producing carbon fibers from polyacrylonitrile at low carbonization temperatures was studied. The bulk and surface properties of fibers obtained after reaction with benzoic acid, air and carbonizing in nitrogen or a dilute acetylene atmosphere are discussed. All fiber products had different surface and internal compositions. Samples produced at temperatures up to 950 C and carbonized in nitrogen contained substantial quantities of nitrogen and oxygen at the surface. During carbonization, the surface nitrogen converted into two new forms, possibly nitrile and an azo or a new carbon-nitrogen bond. Samples carbonized in acetylene contained a carbon-rich surface stable to oxidation.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Textile Research Journal (ISSN 0040-5175); 53; July 198
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  • 84
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    Cavitation erosion characteristics of poly(methyl methacrylate) in a rotating disk device (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The cavitation erosion behavior including the initiation, dynamics and mechanism of damage process on perspex and epoxy resin specimens tested in a rotating disk device were discussed with respect to exposure time. The inception of erosion always took place at the location nearest to the center of rotation of the disk. Subsequently, as exposure time increased, erosion initiated at other locations as well. Light optical photographs and scanning electron micrographs clearly indicate that most of the material loss appears to occur form the networks of cracks due to their interaction and pits indicate particle debris. The optical degradation (loss of transmittance) on perspex was observed to be more on the rear side than on the front side. Previously announced in STAR as N83-11329
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: (ISSN 0043-1648)
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  • 85
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    Comprehensive missile aerodynamics programs for preliminary design (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 12, p. 1851, Accession no. A82-27106
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0022-4560)
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  • 86
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    Equivalent angle-of-attack method for estimating nonlinear aerodynamics of missile fins (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 19, p. 2971, Accession no. A82-39113
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0022-4560)
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  • 87
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    Aerodynamics of wraparound fins (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 07, p. 863, Accession no. A83-21011
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0022-4560)
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  • 88
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    Numerical calculation of nonlinear aerodynamics of wing-body configurations (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 07, p. 864, Accession no. A83-21022
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0001-1452)
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  • 89
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    Benchmark determination of Shuttle Orbiter entry aerodynamic heat-transfer data (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 07, p. 965, Accession no. A82-19777
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0022-4560)
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  • 90
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    Computation of high Reynolds number internal/external flows (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously cited in issue 17, p. 2878, Accession no. A81-39001)
    Schlagwort(e): AERODYNAMICS
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  • 91
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    Ultrahigh Molecular Weight Aromatic Siloxane Polymers (1983)
    In:  CASI
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    Publikationsdatum: 2014-09-11
    Beschreibung: Silphenylene-siloxane polymers can be prepared by a condensation reaction of a diol 1,4-bis(hydroxydimethylsilyl)benzene and a silane bis(dimethylamino)dimethylsilane. Using a stepwise condensation technique, a polymer (R=CH3) with a molecular weight in excess of 1.0 x 1 million has been produced. The polymer exhibits increased thermal stability, compared to a methyl siloxane polymer without the aromatic phenyl ring in the backbone. The use of bis(dimethylamino)methylvinylsilane should allow for ready crosslinking at the vinyl sites (R=-CH=CH2) introduced into the backbone. However, under the conditions of the reaction system a high molecular weight polymer was not obtained or the polymer underwent a crosslinking process during the synthesis.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Alabama Univ. Res. Rept.: 1983 NASA(ASEE Summer Faculty Fellowship Program; 13 p
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  • 92
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    KC-135A Winglet Flight Flutter Program (1982)
    In:  CASI
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    Publikationsdatum: 2014-09-11
    Beschreibung: The evaluation techniques, results and conclusions for the flight flutter testing conducted on a KC-135A airplane configured with and without winglets are discussed. Test results are presented for the critical symmetric and antisymmetric modes for a fuel distribution that consisted of 10,000 pounds in each wing main tank and empty reserve tanks. The results indicated that a lightly damped oscillation was experienced for a winglet configuration of a 0 deg cant and -4 deg incidence. The effects of cant and incidence angle variation on the critical modes are also discussed. Lightly damped oscillations were not encountered for any other winglet cant and incidence angles tested.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Dryden Flight Research Facility KC-135 Winglet Program Rev.; p 171-188
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  • 93
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    Comparison of Flight Measured, Predicted and Wind Tunnel Measured Winglet Characteristics on a KC-135 Aircraft (1982)
    In:  CASI
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    Publikationsdatum: 2014-09-11
    Beschreibung: One of the objectives of the KC-135 Winglet Flight Research and Demonstration Program was to obtain experimental flight test data to verify the theoretical and wind tunnel winglet aerodynamic performance prediction methods. Good agreement between analytic, wind tunnel and flight test performance was obtained when the known differences between the tests and analyses were accounted for. The flight test measured fuel mileage improvements for a 0.78 Mach number was 3.1 percent at 8 x 10(5) pounds W/delta and 5.5 percent at 1.05 x 10(6) pounds W/delta. Correcting the flight measured data for surface pressure differences between wind tunnel and flight resulted in a fuel mileage improvement of 4.4 percent at 8 x 10(5) pounds W/delta and 7.2 percent at 1.05 x 10(6) pounds W/delta. The performance improvement obtained was within the wind tunnel test data obtained from two different wind tunnel models. The buffet boundary data obtained for the baseline configuration was in good agreement with previous established data. Buffet data for the 15 deg cant/-4 deg incidence configuration showed a slight improvement, while the 15 deg cant/-2 deg incidence and 0 deg cant/-4 deg incidence data showed a slight deterioration.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Dryden Flight Research Facility KC-135 Winglet Program Rev.; p 145-170
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  • 94
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    Comparison of subsonic/transonic aftbody flow prediction methods (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously cited in issue 21, p. 3614, Accession no. A81-44900)
    Schlagwort(e): AERODYNAMICS
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  • 95
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    Charging and discharging characteristics of dielectric materials exposed to low- and mid-energy electrons (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Charging and discharging characteristics of dielectric samples exposed to 1-25 keV and 25-100 keV electrons in a laboratory environment are reported. The materials examined comprised OSR, Mylar, Kapton, perforated Kapton, and Alphaquartz, serving as models for materials employed on spacecraft in geosynchronous orbit. The tests were performed in a vacuum chamber with electron guns whose beams were rastered over the entire surface of the planar samples. The specimens were examined in low-impedance-grounded, high-impedance-grounded, and isolated configurations. The worst-case and average peak discharge currents were observed to be independent of the incident electron energy, the time-dependent changes in the worst case discharge peak current were independent of the energy, and predischarge surface potentials are negligibly dependent on incident monoenergetic electrons.
    Schlagwort(e): NONMETALLIC MATERIALS
    Format: text
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  • 96
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    Status of NASA advanced LFC airfoil high-lift study (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The design of a high lift system for the NASA advanced LFC airfoil designed by Pfenninger is described. The high lift system consists of both leading and trailing edge flaps. A 3 meter semispan, 1 meter chord wing model using the above airfoil and high lift system is under construction and will be tested in the NASA Langley 4 by 7 meter tunnel. This model will have two separate full span leading edge flaps (0.10c and 0.12c) and one full span trailing edge flap (0.25c). The performance of this high lift system was predicted by the NASA two dimensional viscous multicomponent airfoil program. This program was also used to predict the characteristics of the LFC airfoils developed by the Douglas Aircraft Company and Lockheed-Georgia Aircraft Company.
    Schlagwort(e): AERODYNAMICS
    Materialart: Laminar Flow Control; p 43-62
    Format: text
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  • 97
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    NASA Langley laminar flow control airfoil experiment (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The design and construction of an advanced swept supercritical airfoil for commercial aircraft to be tested in a transonic wind tunnel is described. The swept LFC airfoil was designed for a given thickness ratio and lift coefficient, with emphasis placed on high critical Mach number with shock-free flow. It is compatible with satisfactory low speed and buffeting characteristics and minimizing the suction laminarization. Further emphasis was placed on achieving shock-free flow over a wide range of off-design conditions including trailing edge flap control. The requirements and design of the suction system and modifications to the Langley 8 foot transonic pressure tunnel is briefly described. Contouring of nonporous test section walls for free air simulation and flow quality improvements is included.
    Schlagwort(e): AERODYNAMICS
    Materialart: Laminar Flow Control; p 1-42
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  • 98
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    Laser processing (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Progress in the Progress ceramic materials is reported. Experiments and models for sintering and microstructure evolution are described. Models and data for understanding the kinetics of grain boundary motion and of pore coarsening and new materials for fuel cells and batteries; are developed. New experimental techniques using lasers for forming fine, monosized powders and for forming stable and metastable structures from liquids, and solar materials research are also developed. Colloidal science and ceramics processing are explored; and research programs on the presintering science necessary for controlled green microstructures are outlined.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: The Mater. Process. Res. Base of the Mater. Process. Center; p 198-209
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  • 99
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    Application of Computational Fluid Dynamics (CFD) in transonic wind-tunnel/flight-test correlation (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The capability for calculating transonic flows for realistic configurations and conditions is discussed. Various phenomena which were modeled are shown to have the same order of magnitude on the influence of predicted results. It is concluded that CFD can make the following contributions to the task of correlating wind tunnel and flight test data: some effects of geometry differences and aeroelastic distortion can be predicted; tunnel wall effects can be assessed and corrected for; and the effects of model support systems and free stream nonuniformities can be modeled.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center Wind-Tunnel(Flight Correlation, 1981; p 199-215
    Format: text
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  • 100
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    Evaluation of waveguide coating materials (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Waveguide coating materials were tested at 8470 MHz for insertion loss. Samples of these coatings on waveguide pieces without flanges were tested in an environmental chamber to simulate the effects of high power microwave heating. Test results indicated that three types of coating materials are acceptable with regard to insertion loss. However, simulated microwave heating caused debonding of Metcot 7 and BD-991 coatings, resulting in peelings in the waveguide. The higher cost Chemglaze R104 does not exhibit this problem.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: The Telecommun. and Data Acquisition Rept.; p 68-71
    Format: text
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