The theory of plasticity represents even in the classical continuum mechanics a field in which certain fundamental problems are not solved. The existing engineering theories give for practical purposes sufficiently good results, but such theories represent only phenomenological descriptions which are more or less in good agreement with experiments, and the nature of the plastic flow from the physical standpoint, except in metals, is not well understood yet.
KeywordsStress Tensor Plastic Flow Yield Condition Couple Stress Kinematical Variable
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