Elastic-plastic fracture toughness with non standard specimes for API 5L steel : numerical and experimental analysis / Tenacidade a fratura em condições elasto-plasticas com corpos de prova não normalisados para aços API 5L : analise numerica e experimental

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The gas pipeline Bolivia-Brazil was manufactured with pipes of API 5L X65 and X70 steels. Specialized literature report that the stress field in the neighborhood of the crack tip and the fracture toughness are similar between not standard single edge notch tensile specimens - SE(T) - and pipes. In this work numerical and experimental study were made of the elastic-plastic fracture toughness using SE(T) specimens for API 5L X65 and X70 steels. The determination of the parameters of the linear elastic fracture mechanics was performed by the methods of the Finite Elements (FEM) and Boundary Elements (BEM). The J-integral parameter was determined by FEM. The plastic eta factor was obtained by FEM and with data supplied by the EPRI method. In both cases for measurements of the crack mouth opening displacement (CMOD) the determined plastic eta factor is 1.0. With this plastic eta factor, experimental tests of fracture toughness were accomplished using SE(T) specimens with thickness of 5 mm, and those values were compared with the test results obtained with standard single edge bend -SE (B)- specimens also with thickness of 5 mm. There was a good agreement between the numeric and experimental results of J-integral. Was verified that the J-R curves obtained with SE(T) specimens are close to the obtained with SE(B) specimens

ASSUNTO(S)

mecanica da fratura metais - propriedade mecanicas aço de alta resistencia se(t) specimens eta plastic factor api 5l steels j-integral fracture toughness

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