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  • 1
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    Technology integration box beam failure study (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The objective of this paper is to describe current results from an on-going study of the mechanisms that led to the failure of the TIBB. Experimental and analytical results are presented. Experimental results include load, strain, and deflection data for the TIBB (Technology Integration Box Beam). An analytical investigation was conducted to compliment the experimental investigation and to gain additional insight into the TIBB structural response. Analytical results include strain and deflection results from a global analysis of the TIBB. A local analysis of the failure region is being completed. These analytical results are validated through comparisons with the experimental results from the TIBB tests. The experimental and analytical results from the TIBB tests are used to determine a sequence of events that may have resulted in failure of the TIBB. A potential cause of failure is high stresses in a stiffener runout region. Typical analytical results are presented for a stiffener runout specimen that is being defined to simulate the TIBB failure mechanisms. The results of this study are anticipated to provide better understanding of potential failure mechanisms in composite aircraft structures, to lead to future design improvements, and to identify needed analytical tools for design and analysis.
    Keywords: STRUCTURAL MECHANICS
    Type: FAA, Ninth DOD(NASA)FAA Conference on Fibrous Composites in Structural Design, Volume 2; p 673-68
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Technology integration box beam failure study (1992)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: Composite structures have the potential to be cost effective, structurally efficient primary aircraft structures. As part of the Advanced Composite Technology (ACT) program to exploit this potential for heavily loaded aircraft structures, the design and fabrication of the technology integration box beam (TIBB) was completed. The TIBB is an advanced composite prototype structure for the center wing section of the Lockheed C-130 aircraft. The TIBB was tested for downbending, upbending, torsion, and combined upbending and torsion load conditions to verify the design. The TIBB failed at 83 percent of design ultimate load for the combined upbending and torsion load condition. Current analytical and experimental results are described for a study of the mechanisms that led to the failure of the TIBB. Experimental results include load, strain, and deflection data. An analytical study was conducted of the TIBB structural response. Analytical results include strain and deflection results from a global analysis of the TIBB.
    Keywords: COMPOSITE MATERIALS
    Type: Second NASA Advanced Composites Technology Conference; p 99-111
    Format: text
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  • 3
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    Great thrust earthquakes and aseismic slip along the plate boundary of the Makran subduction zone (1992)
    In:  J. Geophys. Res., Potsdam, ZIPE, vol. 97, no. B3, pp. 449-478, pp. 2156, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1992
    Keywords: Plate tectonics ; Creep observations and analysis ; Seismology ; Tectonics ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Kenya Rift International Seismic Project, 1989-1990 experiment (1992)
    In:  Eos, Trans., Am. Geophys. Un., New York, Allerton Press, vol. 73, no. 33, pp. 345, 349-351, pp. 2152, (ISSN: 1340-4202)
    Details
    Publication Date: 1992
    Keywords: Deep seismic sounding (espec. cont. crust) ; Seismics (controlled source seismology) ; Tectonics ; Plate tectonics ; Review article
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Geodetic analysis of dike intrusion and motion of the magma reservoir beneath the summit of Kilauea Volcano, Hawaii: 1970-1985 (1992)
    In:  J. Geophys. Res., Sendai, Icelandic Meteorological Office, Ministry for the Environment, University of Iceland, vol. 97, no. 3, pp. 3305-3324, pp. 2212, (ISSN: 1340-4202)
    Details
    Publication Date: 1992
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Geodesy ; Volcanology ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    Covariance of biophysical data with digital topograpic and land use maps over the FIFE site (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This paper discusses the biophysical stratification of the FIFE site, implementation of the stratification utilizing geographic information system methods, and validation of the stratification with respect to field measurements of biomass, Bowen ratio, soil moisture, and the greenness vegetation index (GVI) derived from TM satellite data. Maps of burning and topographic position were significantly associated with variation in GVI, biomass, and Bowen ratio. The stratified design did not significantly alter the estimated site-wide means for surface climate parameters but accounted for between 25 and 45 percent of the sample variance depending on the variable.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; D17; p. 19,009-19,021.
    Format: text
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  • 7
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    Polarimetric and multifrequency SAR signatures of wet snow (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: C-, L-, and P-band polarimetric signatures of wet snow surfaces have been analyzed, based on airborne synthetic aperture radar (AIRSAR) surveys of an Alpine test site. The importance of surface roughness is evident in the C- and L-band signatures, whereas the diffuse scattering contribution by internal inhomogeneities in the snowpack increases from the C- to the P-band at incidence angles below 50 deg due to increasing penetration.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: In: IGARSS '92; Proceedings of the 12th Annual International Geoscience and Remote Sensing Symposium, Houston, TX, May 26-29, 1992. Vol. 2 (A93-47551 20-43); p. 1658-1660.
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  • 8
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    System concepts for a series of lunar optical telescopes (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Lunar Telescope Working Group of the Marshall Space Flight Center, NASA, has conducted conceptual studies of an evolutionary family of UV/ optical/IR telescopes to be based on the lunar surface. Included are: (1) the 16-m aperture Large Lunar Telescope; (2) the 4-m aperture precursor Lunar Cluster Telescope Experiment; and (3) the 2-m Lunar Transit Telescope proposed by John McGraw of the Steward Observatory. Development and emplacement of these advanced astronomical facilities would parallel the buildup of an initial lunar exploration site, an early lunar outpost, and a permanent lunar base. The Working Group has examined the feasibility of constructing such telescopes and assessed technology, subsystem, system, transportation, and operations requirements for their development and emplacement. Influences of the lunar environment and site selection on telescope design and operation were also evaluated.
    Keywords: ASTRONOMY
    Type: In: Engineering, construction, and operations in space III: Space '92; Proceedings of the 3rd International Conference, Denver, CO, May 31-June 4, 1992. Vol. 2 (A93-41976 17-12); p. 1809-1831.
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  • 9
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    Application of information technology to the National Launch System (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The approach to the development of the Unified Information System (UNIS) to provide in a timely manner all the information required to manage, design, manufacture, integrate, test, launch, operate, and support the Advanced Launch System (NLS), as well as the current and planned capabilities are described. STESYM, the Space Transportation Main Engine (STME) development program, is comprised of a collection of data models which can be grouped into two primary models: the Engine Infrastructure Model (ENGIM) and the Engine Integrated Cast Model (ENGICOM). ENGIM is an end-to-end model of the infrastructure needed to perform the fabrication, assembly, and testing of the STEM program and its components. Together, UNIS and STESYM are to provide NLS managers and engineers with the ability to access various types and files of data quickly and use that data to assess the capabilities of the STEM program.
    Keywords: COMPUTER SYSTEMS
    Type: In: Space Congress, 29th, Cocoa Beach, FL, Apr. 21-24, 1992, Proceedings (A93-25276 08-12); p. 5-33 to 5-41.
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  • 10
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    Gas analysis system for the Eight Foot High Temperature Tunnel (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This paper describes the development of a gas collection and analysis system that is to be installed in the Eight-Foot High Temperature Tunnel (8' HTT) at NASA's Langley Research Center. This system will be used to analyze the test gas medium that results after burning a methane-air mixture to achieve the proper tunnel test parameters. The system consists of a sampling rake, a gas sample storage array, and a gas chromatographic system. Gas samples will be analyzed after each run to assure that proper combustion takes place in the tunnel resulting in a correctly balanced composition of the test gas medium. The proper ratio of gas species is critically necessary in order for the proper operation and testing of scramjet engines in the tunnel. After a variety of methane-air burn conditions have been analyzed, additional oxygen will be introduced into the combusted gas and the enriched test gas medium analyzed. The pre/post enrichment sets of data will be compared to verify that the gas species of the test gas medium is correctly balanced for testing of air-breathing engines.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: In: International Instrumentation Symposium, 38th, Las Vegas, NV, Apr. 26-30, 1992, Proceedings (A93-37851 15-35); p. 581-596.
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