Blurred constitutive laws and bipotential convex covers

In many practical situations, incertitudes affect the mechanical behaviour that is given by a family of graphs instead of a single one. In this paper, we show how the bipotential method is able to capture such blurred constitutive laws, using bipotential convex covers

Convergence of a finite element method based on the dual variational formulation

summary:An "equilibrium model" with piecewise linear polynomials on triangular clements applied to the solution of a mixed boundary value problem for a second order elliptic equation is studied. The procedure is proved to be second order correct in $h$ (the maximal side in the triangulation) provided the exact solution is sufficiently smooth