A NEW METHOD TO DETERMINE ELASTO-PLASTIC J-INTEGRAL FOR STEEL 1 PIPES WITH LONGITUDINAL SEMI-ELLIPTICAL SURFACE CRACKS 2 3 Weigang Wang 1 , Wei Yang 2 , Chun-Qing Li 1, * and Shangtong Yang 3 4 5 1 School of Engineering, RMIT University, Melbourne, 3001, Australia 6 2 Faculty of Architecture, Building and Planning, The University of Melbourne, Australia 7 3 Faculty of Engineering, University of Strathclyde, Glasgow, G1 1XQ, United Kingdom 8 9 ABSTRACT 10 Steel pipes have been widely used in the water and petroleum industries where crack-like flaws 11 have long been recognised as a major cause of their failures. This paper intends to develop a 12 new method for determining the elasto-plastic J-integral of cracked pipes made of all types of 13 steel. A solution to elasto-plastic J-integrals is derived for external longitudinal semi-elliptical 14 surface cracks in pressurised steel pipes. A meshing technique is developed in the detailed three- 15 dimensional finite element analysis that incorporates the mixed types of quadratic tetrahedron 16 and hexahedron elements. The developed method is verified with detailed finite element results. 17 It is found in the paper that the general trend of normalised fully plastic J-integral changes with 18 the change of crack depths and aspect ratios, and the magnitude of normalised fully plastic J- 19 integrals can be significantly affected by material properties and pipe dimensions. The 20 developed method can provide a useful tool for the failure assessment of pressurized steel pipes, 21 allowing for a wide range of pipe dimensions, crack geometries and material properties. 22 KEYWORDS 23 Elasto-plastic J; thin-wall pipes; surface crack; 3D finite element; yielding plateau. 24 _____ 25 * Corresponding author, Professor Chun-Qing Li, email: [email protected] 26 Manuscript File Click here to view linked References
A NEW METHOD TO DETERMINE ELASTO-PLASTIC J-INTEGRAL FOR STEEL PIPES WITH LONGITUDINAL SEMI-ELLIPTICAL SURFACE CRACKS
May 29, 2023
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