Consistent Modeling of Thermo-Viscoplasticity for High-Speed Processes
Résumé
A series of high-strain rate tests has been carried out involving high-speed, kinematic and thermal metrology. The concomitant measurement of strain, stress and self-heating allowed the estimation of the inelastic heat fraction and further increase in inelastic stored energy. A thermo-viscoplastic constitutive model has then been developed within the irreversible thermodynamics framework by considering state variables and driving forces different from those usually considered. The experiment-based and physics-motivated approach proposed allows for deriving loading-path dependent self-heating consistently from the constitutive model, without the need for considering any arbitrary inelastic heat fraction.