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A nonoverlapping domain decomposition algorithm of Neumann-Neumann type for solving variational inequalities arising from the elliptic boundary value problems in two dimensions with unilateral boundary condition is presented. First, the linear auxiliary problem, where the inequality condition is replaced by the equality condition, is solved. In the second step, the solution of the auxiliary problem is used in a successive approximations method. In these solvers, a preconditioned conjugate gradient method with Neumann-Neumann preconditioncr is used for solving the interface problems, while local problems within each subdomain are solved by direct solvers. A convergence of the iterative method and results of computational test are reported.

Domain Decomposition Algorithm for Solving Contact of Elastic Bodies