Abstract
A continuum damage mechanics model for the dislocation creep response associated with the growth of parallel planar mesocracks in initially isotropic materials is presented. The model describes simultaneously different damage development in tension, compression and torsion, damage-induced anisotropy, as well as different creep properties in tension, compression and torsion. The proposed constitutive equation for creep and the damage growth equation contain joint invariants of the stress tensor and the second-order damage tensor. The determination of the material parameters required in the proposed equations, from a series of basic experiments, is shown. Theoretical predictions are compared with experimental data for a multiaxial stress state of various materials in the primary, secondary and tertiary creep state under proportional and non-proportional loading.
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