ANISOTROPY AND STRENGTH OF CERAMIC BODIES.
Progress rept. no. 9-12, 15 Oct 63-15 Oct 64,
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF CERAMIC TECHNOLOGY
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The effect of elastic and thermal expansion anisotropy on the strength of ceramic materials is being investigated using ceramic bodies prepared from compositions where one of the anisotropy factors is known to be a minimum. The second order elastic constants of solid solution systems are being measured to determine the effect of composition on elastic anisotropy. The third order elastic constants were successfully measured for fused silica, Ge and MgO. The study of the strength of the grain boundary in bicrystals of MgO is nearing its completion. A theory for calculating the mechanical strength of crystals was developed which makes use of the experimentally determined second and third order elastic constants. This makes possible a more realistic estimation of the maximum strength attainable. Author