Thermodynamically consistent strain hardening variable/driving force, inelastic stored energy and self-heating in dynamic plasticity
Résumé
Accounting for self-heating and subsequent thermal softening in dynamic plasticity requires an accurate estimation
of the mechanical dissipation rate which is by definition the difference between the plastic work rate and the
inelastic stored energy rate. Yet, in constitutive modeling, the evaluation of the inelastic stored energy strongly
depends on the adopted approach, viz. Irreversible thermodynamics vs microstructure-motivated approach, and,
whatever the approach, does not yet lead to realistic results in terms of self-heating. The aim of the present study
is to attempt to conciliate both above mentioned approaches by building constitutive models that relate strain
hardening, inelastic stored energy and self-heating in a consistent way. The models in question are developed in
agreement with experimental results obtained on five high-strength steels.