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

Abstract:

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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.

Info:

Periodical:

Key Engineering Materials (Volumes 326-328)

Edited by:

Soon-Bok Lee and Yun-Jae Kim

Pages:

939-944

DOI:

10.4028/www.scientific.net/KEM.326-328.939

Citation:

H. Y. Lee and Y. J. Kim, "Constraint of Semi-Elliptical Surface Cracks in T and L-Joints", Key Engineering Materials, Vols. 326-328, pp. 939-944, 2006

Online since:

December 2006

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Price:

$35.00

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