Abstract
We consider a mixed variational problem in real Hilbert spaces, defined on the unbounded interval of time \([0,+\infty)\) and governed by a history-dependent operator. We state the unique solvability of the problem, which follows from a general existence and uniqueness result obtained in Sofonea and Matei (J. Glob. Optim. 61:591–614, 2015). Then, we state and prove a general convergence result. The proof is based on arguments of monotonicity, compactness, lower semicontinuity and Mosco convergence. Finally, we consider a general optimization problem for which we prove the existence of minimizers. The mathematical tools developed in this paper are useful in the analysis of a large class of nonlinear boundary value problems which, in a weak formulation, lead to history-dependent mixed variational problems. To provide an example, we illustrate our abstract results in the study of a frictional contact problem for viscoelastic materials with long memory.
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This project has received funding from the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie Grant Agreement No. 823731 CONMECH.
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Sofonea, M., Matei, A. Convergence and Optimization Results for a History-Dependent Variational Problem. Acta Appl Math 169, 157–182 (2020). https://doi.org/10.1007/s10440-019-00293-x
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DOI: https://doi.org/10.1007/s10440-019-00293-x
Keywords
- History-dependent operator
- Mixed variational problem
- Lagrange multiplier
- Mosco convergence
- Pointwise convergence
- Optimization problem
- Viscoelastic material
- Frictional contact