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Symmetric Galerkin boundary element method in plasticity and gradient plasticity

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Abstract

A boundary integral equation (BIE) formulation and a boundary element (BE) method which confer symmetry to key operators are concisely described with reference to quasi-static plasticity. This formulation is based on the combined use of static and kinematic sources, on Galerkin weighted residual enforcement of integral equations for displacements and tractions along the boundary and for stresses in the potentially yielding domain and on space discretizations in terms of generalized variables in Prager's sense. Typical theoretical results of computational interest not available in conventional nonsymmetric BE methods are surveyed. The subjectivity (mesh-dependence) implied by material instability is illustrated by examples. As a remedy, a symmetric BIE-BE formulation for nonlocal, gradient-dependent plasticity is developed and discussed on the basis of its variationally consistent discretization.

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Communicated by S. N. Atluri, 18 August 1995

Dedicated to J. C. Simo

Extended version of a key-note lecture at the 4th International Conference on Computational Plasticity, Barcelona, April 3–6, 1995.

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Maier, G., Miccoli, S., Perego, U. et al. Symmetric Galerkin boundary element method in plasticity and gradient plasticity. Computational Mechanics 17, 115–129 (1995). https://doi.org/10.1007/BF00356484

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