In this paper we study a mathematical model which describes the quasistatic contact between a viscoplastic body and a foundation. The contact is frictionless and is modelled with a new and nonstandard condition which involves both normal compliance, unilateral constraint and memory effects. We present a penalization method in the study of this problem. We start by introducing the penalized problem, then we prove its unique solvability as well as the convergence of its solution to the solution of the original problem, as the penalization parameter converges to zero
(Tiberiu Popoviciu Institute of Numerical Analysis, Romanian Academy)
(Babeş-Bolyai University Faculty of Mathematics and Computer Sciences)
(Laboratoire de Mathématiques et Physique, Université de Perpignan)
F. Pătrulescu, A. Farcaş, A Ramadan, A penalized viscoplastic contact problem with unilateral constraints, Annals of the University of Bucharest – mathematical series, vol. 4 (LXII), no. 1 (2013), pp. 213-227
Editura Universitatii din Bucuresti, Bucuresti
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 Barboteu, A. Matei, M. Sofonea, Analysis of quasistatic viscoplastic contact problems with normal compliance, Quarterly Jnl. of Mechanics and App. Maths. . ?????
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