This paper is concerned with three-dimensional interface (or transmission) problems in solid mechanics which consist of the quasi-static equilibrium condition in a bounded Lipschitz domain $\Omega $, a first order evolution inclusion in $\Omega $, and the homogeneous linear elasticity problem in an unbounded exterior domain $\Omega _2 $. The evolution problem in $\Omega $ models viscoplasticity and Prandtl–Reus plasticity with hardening. In a former paper [SIAM J. Math. Anal., 25 (1994), pp. 1468–1487] the author stated the interface problem as well as an equivalent formulation and proved existence and uniqueness of solutions. Here, the numerical approximation of the solutions is considered via a symmetric coupling of the FEM (finite element method) and BEM (boundary element method) in space and the generalized midpoint rule in time. Besides existence, uniqueness, and uniform boundedness of the solutions of the discrete problems, error estimates proving strong convergence of the numerical procedure are gi...
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