Empirical Solution of Stress Intensity Factors for the Inclined Inner Surface Crack of Pipe under External Pressure and Axial Compression |
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Authors: | Xi-Ming Yao Yu-Chen Zhang Qi Pei Li-Zhu Jin Tian-Hao Ma Xiao-Hua He Chang-Yu Zhou |
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Affiliation: | 1.School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China;2.Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing 211816, China |
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Abstract: | Based on fracture mechanics theory, a finite element method was used to determine the stress intensity factors of the inclined crack on the inner surface of the pipe under axial compression load and external pressure. The effects of different influencing factors on the stress intensity factor along the crack front considering crack closure were systematically explored, which were different to those under internal pressure. The effects of high aspect ratio on KII, the crack inclination asymmetry caused by curvature and the effects of the friction coefficient on the stress intensity factors of the pipe with an inclined inner surface crack under axial compression load and external pressure were explored in this paper. To be fit for defect assessment, the solutions for stress intensity factors KII and KIII were derived, and new correction factors fθ and fμ were proposed in the empirical solutions to accommodate the crack inclination asymmetry and the friction coefficient, respectively. |
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Keywords: | inclined surface crack stress intensity factor pipe crack closure external and axial pressure finite element analysis |
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