In this study, the effect of longitudinal distance H between non-aligned twin cracks is investigated using finite element damage analysis. The FE damage analysis based on the stress-modified fracture strain model is used to calculate the failure stress of non-aligned twin cracked pipe. Parametric study on the axial distance H between non-aligned twin cracks with various crack depths and lengths were conducted and compared with predictions using the alignment rules and the net-section collapse load approach for single crack provided in ASME Code. It is shown that the trend of the predicted collapse bending stresses for the non-aligned twin cracked pipes using FE damage analysis are different from the ones using the alignment rule.
Numerical Study on Longitudinal Distance Effect on Failure Stress of Non-Aligned Twin Cracked Pipe
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Nguyen, T, Lee, M, Hasegawa, K, & Kim, Y. "Numerical Study on Longitudinal Distance Effect on Failure Stress of Non-Aligned Twin Cracked Pipe." Proceedings of the ASME 2018 Pressure Vessels and Piping Conference. Volume 1A: Codes and Standards. Prague, Czech Republic. July 15–20, 2018. V01AT01A051. ASME. https://doi.org/10.1115/PVP2018-84838
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