A metric approach to plasticity via Hamilton-Jacobi equation

Thermodynamical consistency of plasticity models is usually written in terms of the so-called
"maximum dissipation principle". In this paper, we discuss constitutive relations for dissipative
materials written through suitable generalized gradients of a (possibly non-convex) metric. This
new framework allows us to generalize the classical results providing an interpretation of the
yield function in terms of HamiltonJacobi equations theory.