Current-carrying components is, electromechanical devices, such as the armatures of railguns and the field coils in pulsed rotating power supplies, are subjected to complex three-dimensional electromagnetic and thermal loads that are both transient and nonuniform in nature. In many cases, these devices undergo plastic deformations that necessitate use of a plasticity model to simulate their electromechanical behavior. Electromechanical Analysis Program in Three Dimensions (EMAP3D) currently offers the option to export electromagnetic and thermal loading to stress codes like DYNA3D for structural analyses. By implementing a plasticity model into EMAP3D, the large data transfer between codes is eliminated, and a strong (two-way) coupling between mechanical and electromagnetic effects is facilitated. The plasticity model implemented in EMAP3D is based on a corotational system that can accommodate both Jaumann and Green-Naghdi objective stress rates. The model is capable of simulating large deformations in hypoelastic and elastic-plastic materials with isotropic hardening. A radial return algorithm is used to correct the stress increments. The detailed description and validation of the model are presented in the paper.
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