On the behavior of the solution of a viscoplastic contact problem

International audienceWe consider a mathematical model which describes the frictionless contact between a viscoplastic body and an obstacle, the so-called foundation. The process is quasistatic and the contact is modeled with normal compliance and unilateral constraint. We provide a mixed variational formulation of the model which involves a dual Lagrange multiplier, and then we prove its unique weak solvability. We also prove an estimate which allows us to deduce the continuous dependence of the weak solution with respect to both the normal compliance function and the penetration bound. Finally, we provide a numerical validation of this convergence result. - See more at: http://www.ams.org/journals/qam/2014-72-04/S0033-569X-2014-01345-4/#sthash.RPaK8uTG.dpu