Constraint of Semi-Elliptical Surface Cracks in T and L-Joints

Abstract:

Critical defects in pressure vessels and pipes are generally found in the form of a semielliptical surface crack, and the analysis of which is consequently an important issue in engineering fracture mechanics. Furthermore, in addition to the traditional single parameter K or J-integral, the second parameter like T-stress should be measured to quantify the constraint effect. In this work, the validity of the line-spring model is investigated by comparing line-spring J-T solutions to the reference 3D finite element J-T solutions. A full 3D-mesh generating program for semi-elliptical surface cracks is employed to provide such reference 3D solutions. Then some structural characteristics of the surface-cracked T and L-joints are studied by mixed mode line-spring finite element. Negative T-stresses observed in T and L-joints indicate the necessity of J-T two parameter approach for analyses of surface-cracked T and L-joints.

• Periodical: Key Engineering Materials (Volumes 326-328)
• Pages: 939-944
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.326-328.939
• Online since: December 2006
• Authors: Hyung Yil Lee, Yun Jae Kim
• Keywords: Finite Element Analysis (FEA), Ĵ-Integral, Line-Spring Finite Element, L-Joint, Semi-Elliptical Surface Crack, T-Joint, T-Stress

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