Normality Rule? Plastic Work Extremals and Related Topics

Part of the Advances in Mechanics and Mathematics book series (AMMA, volume 20)

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.


Plastic Strain Yield Surface Plastic Work Plastic Strain Rate Strain Space 
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Copyright information

© Springer-Verlag New York 2009

Authors and Affiliations

  1. 1.Mechanical EngineeringMarkovic UniversityKragujevacSerbia

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