Elasto-viscoplastic analysis of composite materials considering thermomechanical coupling effects

In this paper, thermoviscoplastic analyses are performed to view the thermomechanical coupling effects in composite materials. An extended unmixingmixing scheme is utilized to describe the orthotropic thermo-elasto-viscoplastic characteristics of composite materials. The equation of motion and the energy conservation equation based on the fully-coupled thermodynamics are formulated with the constitutive arrangement by the unmixing-mixing concept. In computational aspects, the governing equations are discretized by the finite element method. The resulting nonlinear simultaneous equations are derived in incremental forms, and are solved iteratively. Finally, some representative numerical examples are presented. The results show the basic feature of the coupled mathematical model, the validity of the formulation, and the efficiencies of the algorithms.