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Local finite element enrichment strategies for 2D contact computations and a corresponding post-processing scheme

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Abstract

Recently an enriched contact finite element formulation has been developed that substantially increases the accuracy of contact computations while keeping the additional numerical effort at a minimum reported by Sauer (Int J Numer Meth Eng, 87: 593–616, 2011). Two enrich-ment strategies were proposed, one based on local p-refinement using Lagrange interpolation and one based on Hermite interpolation that produces C 1-smoothness on the contact surface. Both classes, which were initially considered for the frictionless Signorini problem, are extended here to friction and contact between deformable bodies. For this, a symmetric contact formulation is used that allows the unbiased treatment of both contact partners. This paper also proposes a post-processing scheme for contact quantities like the contact pressure. The scheme, which provides a more accurate representation than the raw data, is based on an averaging procedure that is inspired by mortar formulations. The properties of the enrichment strategies and the corresponding post-processing scheme are illustrated by several numerical examples considering sliding and peeling contact in the presence of large deformations.

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Correspondence to Roger A. Sauer.

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Sauer, R.A. Local finite element enrichment strategies for 2D contact computations and a corresponding post-processing scheme. Comput Mech 52, 301–319 (2013). https://doi.org/10.1007/s00466-012-0813-8

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  • DOI: https://doi.org/10.1007/s00466-012-0813-8

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