SELFCONSISTENT DETERMINATION OF THE X-RAY ELASTIC CONSTANTS OF POLYCRYSTALLINE MATERIALS FOR ARBITRARY CRYSTAL SYMMETRY, N. Koch, H. Wern, pp. 200-205
نویسنده
چکیده
For the calculation of load or residual stresses from measured strain data by means of x-rays or neutrons, the so called x-ray elastic constants are required. Usually they are calculated from the corresponding single crystal data assuming some models such as Voigt, Reuss or Kröner. In this paper, the finite element method is used to guarantee both, stress equilibrium and strain compatibility across the grain boundaries. The method is applicable to materials with a random texture as well as to specimens with a given texture using the information of the Orientation Distribution Function (ODF). All crystal structures are supported. The method is demonstrated on trigonal Al2O3 and on textured thin films of Tungsten and Niobium.
منابع مشابه
NUMERICAL SIMULATION OF THE X-RAY STRESS ANALYSIS TECHNIQUE IN POLYCRYSTALLINE MATERIALS WITH HEXAGONAL CRYSTAL SYMMETRY, H. Wern, T. Maas, N. Koch, pp. 122-127
In this paper, the correlation between the local strain distributions and the average strains obtained by an x-ray measurement are studied through numerical modeling. The finite element method (FEM) is used to simulate the local strain distributions within a three-dimensional random aggregate of isotropic and orthotropic single crystals with hexagonal symmetry under uniaxial elastic tension. Ca...
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