Abstract
In this study, thermodynamic incompatibility issues of the thermo-mechanical coupling of the Bammann-temperature-dependent plasticity-damage internal state variable (ISV) model are investigated. The exclusion of the thermal expansion phenomena from the Helmholtz free energy, as assumed in the model, is proven to contradict the First and Second Law of Thermodynamics, as well as the omnipresence principle. Four different approaches are discussed to address those issues, and the inclusion of the thermal expansion as a dependent variable in the Helmholtz free energy is considered the most appropriate and efficient. Based on these findings, a multiphysics ISV theory that couples the elasto-visco-plasticity-damage model of Bammann with thermal expansion is presented in which the kinematics, thermodynamics, and kinetics are internally consistent. Other material models may benefit from the findings of this study and apply similar modifications with their thermo-mechanical couplings.
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Dimitrov, N., Liu, Y. & Horstemeyer, M.F. On the thermo-mechanical coupling of the Bammann plasticity-damage internal state variable model. Acta Mech 230, 1855–1868 (2019). https://doi.org/10.1007/s00707-019-2365-x
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DOI: https://doi.org/10.1007/s00707-019-2365-x