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  • NONMETALLIC MATERIALS  (2)
  • 1
    facet.materialart.
    Unknown
    The failure strengths of perfect diamond crystals (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Finite elasticity analysis is extended to the 110 direction, where off axis strain symmetry is not present, and the third order elastic data are obtained for diamond. The compressive yield strengths of perfect diamond crystals loaded in the 100, 110, and 111 directions are predicted to be 2.2, 5.6, and 2.8 Mbars, respectively, while the corresponding tensile fracture strengths are 1.0, 0.5, and 0.5 Mbars. From these results and from Hertz theory it is predicted that ring fracture of spherically tipped diamonds pressed against a flat will occur at pressures of 1.8-1.9 Mbars, substantially below the yield pressure (above 3 Mbars). Modification of the tip shape leads to a predicted increase in the pressure at which fracture occurs.
    Keywords: NONMETALLIC MATERIALS
    Type: Scripta Metallurgica; 15; May 1981
    Format: text
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  • 2
    facet.materialart.
    Unknown
    Static compression of Al2O3 to 1.2 Mbars /120 GPa/ (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Pressures up to 120 GPa were generated when a diamond indentor of radius 10.0 micrometers was pressed against a very thin sample of Al2O3 on a diamond flat. The thin film of Al2O3 was prepared by sputtering of aluminum in an oxygen atmosphere. From the measurement of the electrical resistance of Al2O3 as a function of pressure it was found that Al2O3 remains an insulator at the highest pressure studied, namely, 120 GPa.
    Keywords: NONMETALLIC MATERIALS
    Type: Journal of Applied Physics; 50; Feb. 197
    Format: text
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