Modeling of high homologous temperature deformation behavior for stress and life-time analyses
- Rensselaer Polytechnic Institute, Troy, NY (United States)
Stress and lifetime analyses need realistic and accurate constitutive models for the inelastic deformation behavior of engineering alloys at low and high temperatures. Conventional creep and plasticity models have fundamental difficulties in reproducing high homologous temperature behavior. To improve the modeling capabilities {open_quotes}unified{close_quotes} state variable theories were conceived. They consider all inelastic deformation rate-dependent and do not have separate repositories for creep and plasticity. The viscoplasticity theory based on overstress (VBO), one of the unified theories, is introduced and its properties are delineated. At high homologous temperature where secondary and tertiary creep are observed modeling is primarily accomplished by a static recovery term and a softening isotropic stress. At low temperatures creep is merely a manifestation of rate dependence. The primary creep modeled at low homologous temperature is due to the rate dependence of the flow law. The model is unaltered in the transition from low to high temperature except that the softening of the isotropic stress and the influence of the static recovery term increase with an increase of the temperature.
- Research Organization:
- Argonne National Lab., IL (United States)
- DOE Contract Number:
- FG02-96ER14603
- OSTI ID:
- 569671
- Report Number(s):
- CONF-9705121--; ON: DE98000902
- Country of Publication:
- United States
- Language:
- English
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