X-RAY DETERMINATION OF ELASTIC CONSTANTS E AND GAMMA
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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The existing method of x-ray determination of elastic constants requires several tens of x-ray photographs to be taken, which is very tedious. In order to simplify the method of determining the elastic constants, the author transforms the formulas of the relative strains in different directions for the case of a linear strained state in such a way that the stresses and modulus of elasticity are eliminated. Poissons coefficient then is expressed in terms of three interplane distances of the atomic planes. As a result, for the determination of Poissons coefficient, one may confine oneself to taking only three x-ray photographs. To find the modulus of elasticity one needs also to know the stresses arising in the object. The author shows that a similar method also is possible for the plane stressed state, but that in this case at least four x-ray photographs must be taken.