Analise de problemas de trincas interfaciais usando o metodo dos elementos de contorno

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

This thesis presents a procedure for computation of stress intensity factors due to the presence of interfacial cracks in bimaterial components. The procedure makes use of boundary elements method based on the formulation for bidimensional isotropic problems ldaded either in mode I or in mixed mode. The method of subregions was used to describe each one of the different subdomains, represented by each material. The domain is divided in two subregions. Conditions of displacement continuity and tractions equilibrium are imposed at the interface, except in the corresponding crack region. The system of equations for the full domain is written adding the system of equations for each subregion. The considered procedure uses a direct boundary element formulation together with traction singular quarter point elements that is very accurate to describe the stress field at crack tipo The stress intensity factors are computed using equations given in the literature. Analysis of results convergence due to mesh refinement is carried out. It is shown that the results have little dependence on the model discretization and good results are obtained even when a coarse mesh is used. A comparison between the results obtained in this work and those from literature show that they are in good agreement

ASSUNTO(S)

materiais compostos mecanica da fratura metodos de elementos de contorno

ACESSO AO ARTIGO

Documentos Relacionados