Plastic work induced heating evaluation under dynamic conditions : critical assessment
Résumé
In many engineering problems involving adiabatic (dynamic) conditions the temperature rise induced by plastic deformation is usually evaluated using the inelastic heat fraction. The latter is still frequently considered as a crudely determined constant value. On the other hand, experimental investigations have shown that the inelastic heat fraction depends on strain, strain rate and temperature. Employing a phenomenological double-potential, elastic/thermoviscoplastic constitutive framework, the intrinsic dissipation form and heat equation considered correspond to salient features of inelastic behaviour of a large class of solids. For some typical strain hardening/softening and thermal softening combinations encountered, the evolution of inelastic heat fraction is being studied and quantified and finally shown to be highly strain and temperature dependent.