A viscoplastic model including non-linear isotropic and kinematic hardening

== Abstract ==

In this work the formulation of a general elasto-viscoplastic constitutive model is consistently derived within a thermodynamic framework. The constitutive behavior has been by a elasto-plastic free energy function. Plastic response has been modeled considering a J2 viscoplastic constitutive model, including non-linear isotropic and kinematic hardening. Time integration and linearization of the constitutive model is also introduced.

Finally, a number of numerical tests will show the mechanical response of a specimen submitted to a loading-unloading cycle. 

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