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Evaluation of the extended finite element method for the analysis of bonded joints

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Resumo:The extended finite element method is an innovative approach based on finite element method. Where finite element method needs to change the mesh at every step of a crack propagation, extended finite element method does not because the mesh does not need to follow the crack anymore, that is why this method is very well suited for fracture problems. This master’s thesis is the development of the 2D part of this method. The XFEM tool in Abaqus is evaluated for two dimensional stationary cracks with a variety of parameters and features such as meshing technique, element size, symmetry and sub modeling. The purpose is to find a robust and flexible strategy to model cracks. The strategy is verified through handbook cases modeled in Abaqus, where the accuracy has been evaluated. The study was conducted through a numerical analysis by the eXtended Finite Element Method (XFEM) based on stress and strain criteria, which was validated with previously obtained experimental results. The numerical analysis allowed the study of the stress distributions, the effect of the damage initiation criterion, the effect of the propagation law and also the joints strength. The XFEM analysis revealed that this method is fully accurate when using the QUADS initiation criterion, growth criteria and the triangular propagation law. It was shown that the SLJ and DLJ adherend’s geometry and the adhesive type are the most important parameters affecting the joints strength.
Autores principais:Ramesh, Vignesh
Assunto:Adhesive joints Single-Lap joints Double-Lap joints Experimental tests Structural adhesive eXtended Finite Element Method Juntas adesivas Juntas de sobreposicao simples Juntas de sobreposicao dupla Ensaios experimentais Adesivo estrutural Método dos Elementos Finitos eXtendido
Ano:2018
País:Portugal
Tipo de documento:dissertação de mestrado
Tipo de acesso:acesso aberto
Instituição associada:Instituto Politécnico do Porto
Idioma:inglês
Origem:Repositório Científico do Instituto Politécnico do Porto

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