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A fast boundary element based solver for localized inelastic deformations

Federico Ciardo 1 Brice Lecampion 1 François Fayard 2 Stéphanie Chaillat 3 
3 POEMS - Propagation des Ondes : Étude Mathématique et Simulation
Inria Saclay - Ile de France, UMA - Unité de Mathématiques Appliquées, CNRS - Centre National de la Recherche Scientifique : UMR7231
Abstract : We present a numerical method for the solution of nonlinear geomechanical problems involving localized deformation along shear bands and fractures. We leverage the boundary element method to solve for the quasi-static elastic deformation of the medium while rigid-plastic constitutive relations govern the behavior of displacement discontinuity (DD) segments capturing localized deformations. A fully implicit scheme is developed using a hierarchical approximation of the boundary element matrix. Combined with an adequate block preconditioner, this allows to tackle large problems via the use of an iterative solver for the solution of the tangent system. Several two-dimensional examples of the initiation and growth of shear-bands and tensile fractures illustrate the capabilities and accuracy of this technique. The method does not exhibit any mesh dependency associated with localization provided that (i) the softening length-scale is resolved and (ii) the plane of localized deformations is discretized a priori using DD segments.
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Submitted on : Thursday, November 26, 2020 - 9:41:24 AM
Last modification on : Friday, July 8, 2022 - 10:10:42 AM
Long-term archiving on: : Saturday, February 27, 2021 - 6:24:49 PM


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Federico Ciardo, Brice Lecampion, François Fayard, Stéphanie Chaillat. A fast boundary element based solver for localized inelastic deformations. International Journal for Numerical Methods in Engineering, Wiley, 2020, 121 (24), pp.5696 - 5718. ⟨10.1002/nme.6520⟩. ⟨hal-02997409⟩



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