Development of methods for damage modeling with enhanced rheological models for the simulation of forming processes

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The research project is concerned with the modeling and simulation of thermomechanically coupled behavior of metallic materials for the application in industrial forming processes. The first funding period has been focused on the development of methods for the constitutive modeling, taking into account the evolution of damage in the material. For this purpose, the rheological concept for representing the thermoviscoplastic material behavior under the consideration of recovery processes and the storage / dissipation of energy during inelastic deformations, as proposed in preceding research works, has been enhanced for capturing thermomechanical consistently the damage processes as well. Moreover, based on a finite rheological network representation, a systematical approach has been developed to allow for the generalization of the constitutive equations of uniaxial rheological models for large deformations in the framework of nonlinear continuum mechanics.Besides some additional aspects of material modeling, the forthcoming third project year concentrates on the implementation of the constitutive model with damage into a commercial FE-programm for the explicit and implicit time integration of the equation of motion, as well as on the parameter identification and the validation of the model, to allow for the numerical analysis and the optimization of thermomechanically coupled, quasi-static and dynamical, complex practice-oriented forming processes.