Thermoplasticity
Thermomechanical coupling

Dissipated energy. Stored energy

During plastic deformation, a large proportion of the mechanical energy supplied is transformed into heat. In metallic materials, the physical origin of this dissipation is explained by the movement of dislocations in the crystal lattice. The rest of the energy supplied is stored in the material. For a plastic deformation varying from 0 to ε_p, let W_p be the mechanical work supplied and ${\mathcal{E}}_{\mathrm{s}}$ the energy stored.

We then define the fraction of stored energy noted f :