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  • ENGINEERING (GENERAL)  (4)
  • STRUCTURAL MECHANICS  (1)
  • 1975-1979  (5)
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  • 1
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    The relation of the yield stress of high-pressure anvils to the pressure attained at yielding and the ultimate attainable pressure (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A sensitive microprofilometer was used to determine the onset of yielding in the anvils of a supported opposed anvil device for the case of 3% cobalt-cemented tungsten carbide as the anvil material. In addition, it is shown how the commencement of yielding in boron carbide pistons, the yield strength being known, can be used to obtain the transition pressure to a conducting phase in gallium phosphide. The transition pressures of bismuth and gallium phosphide are obtained and it is found that these transitions are extremely close to the maximum attainable pressure in, respectively, a maraging steel and a 3% cobalt-cemented tungsten carbide.
    Keywords: ENGINEERING (GENERAL)
    Type: Journal of Applied Physics; 50; Feb. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Analysis of resistance-versus-pressure relations for the diamond indentor-anvil system (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Pressures in excess of 1.4 Mbars have been attained by Ruoff and Wanagel (1977) by pressing tiny spherical diamond indentors (tip radius of 2 microns or less) against a diamond anvil. This system has been used for resistance-vs-pressure measurements as follows. A thin (200 A) coherent layer of a conductor, e.g., palladium, can be sputtered on the tip and on the anvil and electrical leads can then be attached to these at points remote from the contact area. Then a thin layer of the sample to be studied can be evaporated, sputtered, or placed on the anvil. When the indentor is pressed against the sample, the resistance changes as the pressure increases and as the contact radius increases. This paper analyzes the resistance-vs-pressure relationship for three different types of resistivity-vs-pressure behavior.
    Keywords: ENGINEERING (GENERAL)
    Type: Journal of Applied Physics; 50; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Analysis of contact pressures attainable using indentors which are bodies of revolution (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The elastic behavior of a conical indentor with a rounded tip pressed against a flat anvil has been analyzed. It is found that when the radius of contact extends beyond the rounded tip, the contact radius increases much more rapidly as the pressure increases than it does for the case of a fully spherical or parabolic tip. Consequently, the pressure achieved for a rounded conical tip for a given applied force is considerably less than for a spherical or parabolic tip.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Applied Physics; 47; Nov. 197
    Format: text
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  • 4
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    Linear ruby scale and one megabar (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The accuracy and validity of certain techniques used in studying high-pressure transitions have been investigated. Experiments which place upper limits of about 20 GPa and about 50 GPa on pressures practically attainable using uniaxial supported opposed anvil devices with tungsten carbide pistons and uniaxial opposed flat anvil diamond devices, respectively, are reported. Direct static determinations of the transition pressures of GaP by two different methods are described. The values obtained indicate that the linear ruby scale increasingly overestimates the transition pressure as the pressure rises above 10 GPa. It is further shown that the use of shock-based marker materials, such as silver, as the basis of pressure measurement in X-ray diffraction studies leads to bulk moduli of cubic carbides which are in extreme disagreement with expected values.
    Keywords: ENGINEERING (GENERAL)
    Type: High-pressure science and technology; Sixth International Conference; Jul 25, 1977 - Jul 29, 1977; Boulder, CO
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A split sphere 60,000 ton press (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A split sphere press which can have a total force of 60,000 tons applied to its exterior by a 0.55 GPa hydrostatic pressure vessel is described. The inner anvils are made of tungsten carbide and show considerable plastic deformation under load. Much greater pressures, in the 100 GPa range, are possible if diamond tipped anvils are used. Because of the uniformly loaded multi-anvil arrangement, the diamond tips can be maintained under a high degree of compressive load and therefore prevent fracture which may occur in a conventional opposed anvil arrangement. Press operation on CdS, ZnSe, ZnS, GaP, and BP samples is described, and their resistance versus external pressure on the sphere are plotted.
    Keywords: ENGINEERING (GENERAL)
    Type: High-pressure science and technology; Sixth International Conference; Jul 25, 1977 - Jul 29, 1977; Boulder, CO
    Format: text
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