Abstract
The elastic modulus E of diamond is often set equal to 1 s 11 = 1050 GPa, which assumes that it does not vary much with orientation, and many authors use v = 0.2 as an appropriate average value of Poisson's ratio, which is incorrect. In this paper, we show that, since the elastic constants of diamond are known with great accuracy, it is a straightforward matter to derive exact numbers for E and v that take into consideration the stress direction, the intrinsic anisotropy, as well as the crystalline configuration. For textured CVD diamond deposits, we find that, in a first approximation, the Hershey-Kröner-Eshelby averaging procedure yields acceptable numbers, E ̄ = 1143 GPa and v ̄ = 0.0691 , which are quite compatible with available experimental evidence; this confirms that high-quality deposits have elastic constants similar to those of single-crystal natural diamond.
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