Abstract
Starting from the assumption that all possible orientations of grains are equally probable, we prove that the geometric factor of thermodynamic dislocation theory for polycrystals subjected to axially symmetric tension or compression must be equal to 2. We then use large-scale least-square analysis to identify the physics based parameters of this theory and show that the simulated stress-strain curves for OFHC copper, ARMCO iron and 4340 steel agree well with the experiments of Johnson and Cook.
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