Abstract
Abstract A constitutive model is developed to describe the anisotropic secondary creep response of polycrystalline metals and alloys with different behavior in tension and compression. The equivalent stress in the general anisotropic potential contains the linear and quadratic joint invariants of the stress tensor, and the second order and fourth order material tensors. In describing the creep behavior of orthotropic materials for the special case of coincidence of the coordinate axes with the principal directions of anisotropy, a nine parameter expression for the equivalent stress is proposed with the corresponding constitutive equation of creep. The determination of the material parameters in the proposed creep equation is obtained from a series of basic experiments outlined in this work. The results generated from the model are compared with those from experiments under multiaxial loading for various metallic materials.
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