Abstract
The traditional elastoplastic constitutive equation, which is inde- pendent of the stress rate component tangential to the yield surface predicts an unrealistically stiff mechanical response for the nonproportional loading proc- ess in which the stress rate has a component tangential to the yield surface. In this article, the generalized constitutive equation is then formulated by incor- porating the inelastic strain rate due to the stress rate tangential to the subload- ing surface into the subloading surface model exhibiting a smooth elastic- plastic transition.
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