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  • METALLIC MATERIALS  (26)
  • AERODYNAMICS  (25)
  • 2000-2004
  • 1980-1984  (37)
  • 1975-1979  (14)
  • 1
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    The initial stages of cavitation damage and erosion on copper and brass tested in a rotating disk device (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: (Previously announced in STAR as N83-13231)
    Keywords: METALLIC MATERIALS
    Type: Cavitation and Polyphase Flow Forum - 1982; Jun 07, 1982 - Jun 11, 1982; St Louis, MO
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Initial stages of cavitation damage and erosion on copper and brass tested in a rotating disk device (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In view of the differences in flow and experimental conditions, there has been a continuing debate as to whether or not the ultrasonic method of producing cavitation damage is similar to the damage occurring in cavitating flow systems, namely, venturi and rotating disk devices. In this paper, the progress of cavitation damage during incubation periods on polycrystalline copper and brass tested in a rotating disk device is presented. The results indicate several similarities and differences in the damage mechanism encountered in a rotating disk device (which simulates field rotary devices) and a magnetostriction apparatus. The macroscopic erosion appears similar to that in the vibratory device except for nonuniform erosion and apparent plastic flow during the initial damage phase.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-82993 , E-1424 , NAS 1.15:82993 , Cavitation and Polyphase Flow Forum; Jun 07, 1982 - Jun 11, 1982; St. Louis, MO; United States
    Format: application/pdf
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  • 3
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    Size scale effect in cavitation erosion (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An overview and data analyses pertaining to cavitation erosion size scale effects are presented. The exponents n in the power law relationship are found to vary from 1.7 to 4.9 for venturi and rotating disk devices supporting the values reported in the literature. Suggestions for future studies were made to arrive at further true scale effects.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-83533 , E-1538-1 , NAS 1.15:83533
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  • 4
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    An exploratory study of area-efficient vortex flap concepts (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: 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.
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft (ISSN 0021-8669); 20; 1062-106
    Format: text
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  • 5
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    Morphology of an aluminum alloy eroded by a normally incident jet of angular erodent particles (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The erosion morphologies resulting from the normal impact of crushed glass particles upon 6061-T6 aluminum alloy are examined by scanning electron microscopy and energy-dispersive X-ray spectroscopy. Four distant erosion regions are identified. It is shown that the transition to cutting wear occurs simultaneously with the transition from the incubation stage of erosion to the acceleration stage. It is also shown that the erosion rate depends exponentially on the velocity of the particles, with an exponent of 3.68, which is in good agreement with other investigations at normal incidence.
    Keywords: METALLIC MATERIALS
    Type: Wear (ISSN 0043-1648); 92; 31-49
    Format: text
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  • 6
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    Deformation and erosion of f.c.c. metals and alloys under cavitation attack (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Experimental investigations have been conducted to determine the early stages of cavitation attack on 6061-T6 aluminum alloy, electrolytic tough pitch copper, brass, and bronze, all having polycrystalline fcc matrices. The surface profiles and scanning electron micrographs show that the pits are initially formed at the grain boundaries, while the grain surfaces are progressively roughened by multiple slip and twinning. The initial erosion is noted to have occurred from the material in the grain boundaries, as well as by fragmentation of part of the grains. Further erosion occurred by shearing and necking of the surface undulations caused by plastic deformation. The mean penetration depth, computed on the basis of mass loss, was lowest on the bronze and greatest on the copper. Attention is given to the relation of cavitation attack to grain size, glide stress and stacking fault energy.
    Keywords: METALLIC MATERIALS
    Type: Materials Science and Engineering (ISSN 0025-5416); 67; 55-67
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  • 7
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    A study of the effect of solid particle impact and particle shape on the erosion morphology of ductile metals (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Impulsive versus steady jet impingement of spherical glass bead particles on metal surfaces was studied using a gas gun facility and a commercial sand blasting apparatus. Crushed glass particles were also used in the sand blasting apparatus as well as glass beads. Comparisons of the different types of erosion patterns were made. Scanning electron microscopy, surface profilometry and energy dispersive X-ray spectroscopy analysis were used to characterize erosion patterns. The nature of the wear can be divided into cutting and deformation, each with its own characteristic features. Surface chemistry analysis indicates the possiblity of complex chemical and/or mechanical interactions between erodants and target materials.
    Keywords: METALLIC MATERIALS
    Type: Journal of Microscopy (ISSN 0022-2720); 135; 49-59
    Format: text
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  • 8
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    Hypersonic incipient separation on delta wing with trailing-edge flap (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The paper reviews the experimental data on the incipient separation characteristics of planar delta wings of 75 degree sharp leading edges, with full-span trailing edge flap deflected into the windward flow. The local Reynolds number range for these investigations covered laminar, transitional and turbulent conditions. It is shown that, while turbulent boundary layer data correlates with two dimensional results, in the laminar and transitional cases, there is a nearly parallel shift to higher flap angles for incipient separation.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 13; Oct. 197
    Format: text
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  • 9
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    Application of radial-splitters for improved wide-angle diffuser performance in a blowdown tunnel (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Severe flow separation in the 15:1 area-ratio, 38 deg total angle conical diffuser preceding the settling-chamber of an intermittent blowdown wind tunnel was eliminated by the use of a novel radial-splitter arrangement. As a consequence, the operating life of settling-chamber screens was greatly extended and test-section flow steadiness improved, with no penalty in the tunnel running time.
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft; 13; July 197
    Format: text
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  • 10
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    Influence of temperature and the role of chromium on the kinetics of sulfidation of 310 stainless steel (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Keywords: METALLIC MATERIALS
    Type: Oxidation of Metals; 12; Apr. 197
    Format: text
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