1. Visco-plastic behavior
1.1 Norton-Hoff viscoplastic behavior law
From a physical standpoint, the plastic flow stress depends, at elevated temperatures, on the strain rate, since dislocation motion is thermally activated; this implies that it also depends on temperature (see Figure 9 in the document
The simplest generalization of the tensile test results is to assume that the plastic flow stress σ0 behaves like the tensile stress and depends only on .
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Visco-plastic behavior
Elasto-viscoplasticity and thermophysical couplings
Bibliography
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