Abstract
A method is presented to calculate the X-ray elastic constants from the orientation distribution function (O.D.F.) describing the texture of the material. The method is based on the Reuss and the Voigt theories, and on a mixed model. A surface effect is discussed. It is suggested, that near the surface, the elastic strains of the crystals are less constrained, which affects the model to be used for the analysis of X-ray data.
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