Normality Rule? Plastic Work Extremals and Related Topics
The task in this chapter is to reexamine the background of the so-called “normality” principle, i.e., the widely accepted assumption that plastic strain rate tensor is perpendicular to a yield surface in the corresponding stress space. In the papers [Dru52, Ili61, Hil68] this conclusion has been drawn from analysis of the plastic work properties. For instance, in [Dru52], rate-independent plasticity was considered and contemplating that all stress increments were admissible normality was concluded from the assumption of plastic work positiveness for arbitrary stress cycle.
KeywordsPlastic Strain Yield Surface Plastic Work Plastic Strain Rate Strain Space
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