Istituto di Scienza e Tecnologie dell'Informazione     
Lucchesi M., Silhavy M. Thermoplastic materials with combined hardening. Internal note CNUCE-B4-92-012, 1992.
The constitutive equations of an rate-independent thermoplastic material with combined hardening at large deformations are presented. The compatibility of the model with the second law of thermodynamics is examined. The entropy function is constructed explicitly under general conditions. For isotropically hardening materials a complete description of the entropy functions is given and for ideal theroplastic materials a condition ensuring the uniqueness of the entropy is presented. Also the validitg of the non-isothermal generalization of Il'yushin's condition is established.
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