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Author(s): Filipe X. C. Andrade
Francisco M. Andrade Pires
José M. A. César de Sá
Lucival Malcher
Title: Nonlocal integral formulation for a plasticity-induced damage model
Issue Date: 2009
Abstract: Ductile failure prediction commonly involves the use of the finite element method within an elasto-plasticity frameworkcoupled with damage. As strain localisation takes place, the partial differential equilibrium equation experiencesa loss of ellipticity and the numerical result becomes mesh dependent. One possible approach is to regularise the solutionby the introduction of an internal length, which is related to the microscopic structure of the material. In this context,nonlocal integral and gradient-enhanced formulations [2] are commonly employed as regularisation strategies. In thiswork, a finite element formulation based on a nonlocal integral implementation proposed by Strömberg & Ristinmaa [7]is extended for a simplified version of Lemaitres ductile damage model [1]. Since only the computation of the internalforce is affected in this strategy, its implementation in existing FE codes is relatively straightforward. The results ofa sample case show that the implemented strategy acts as localisation limiter.
Subject: Engenharia mecânica, Engenharia mecânica
Mechanical engineering, Mechanical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia mecânica
Engineering and technology::Mechanical engineering
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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