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Continuum plasticity

Please suggest self study book for continuum plasticity theory

Hello, I am new to theory of plasicity and need to learn it by myself. Please suggest a good book for self study for continuum plasticity theory. I am specially interested in metal plasticity theories, in analytical and numerical aspects.

General Return Mapping in the softening regime

The interpretation of general return mapping integration algorithm as closest point projection of the trial stress state leads to a lagragian with arguments as the state of the system. In the hardening regime, this lagragian is convex and newton's method guarantee uniqueness and convergence (Simo and Hughes). I am interested in the case when the lagragian is no longer definetively convex as could be the case in softening regime. Can anybody suggest me numerical techniques for this case?

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