Plasticity, 5, —, Fracture Mech.
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5. Yield Criteria for Anisotropic Polycrystals
Font Size. Engineering Transactions, 49 , 4, pp. Model of evolution of plastic anisotropy due to crystallographic texture development in metals subjected to large deformation processes is presented. The rigid-plastic model of single grain with regularized Schmid law proposed by Gambin is used.
Phenomenological and physical descriptions of plastic flow of polycrystals are discussed. Properties of any yield function for orthotropic material subjected to the plane stress state are outlined. It can be seen from looking at our models of crystalline structure that atoms should be able to slip over one another or distort in relation to one another easier in some directions than others.
Bulletin of the American Physical Society
When the properties of a material vary with different crystallographic orientations, the material is said to be anisotropic. Alternately, when the properties of a material are the same in all directions, the material is said to be isotropic. For many polycrystalline materials the grain orientations are random before any working deformation of the material is done.
Therefore, even if the individual grains are anisotropic, the property differences tend to average out and, overall, the material is isotropic. When a material is formed, the grains are usually distorted and elongated in one or more directions which makes the material anisotropic. About NDT.
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Volume 68 , Issue 2 16 December Pages Related Information. Close Figure Viewer. Browse All Figures Return to Figure. Previous Figure Next Figure.
Mechanism of induced plastic anisotropy on polycrystalline metals
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