In this paper, applicability of net-section collapse load approach to circumferential multiple-cracked pipe assessment is investigated using finite element (FE) damage analysis. The FE damage analysis based on the stress-modified fracture strain model is validated against limited fracture test data of two circumferential surface-cracked pipes. Then, the systematic parametric study is performed using the FE damage analysis for symmetrical and asymmetrical surface-cracked pipes. It is found that predictions using the net-section collapse load approach tend to be more accurate with increasing the distance between two symmetrical cracks. For asymmetrical cracks, it is found that the deeper crack plays a more important role and that the existing net-section collapse load expression can be potentially nonconservative. Idealization to symmetrical cracks based on the deeper crack is proposed.
Applicability of Net-Section Collapse Load Approach to Multiple-Cracked Pipe Assessment: Numerical Study
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 12, 2016; final manuscript received April 26, 2017; published online May 26, 2017. Assoc. Editor: Haofeng Chen.
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Lee, M., Lee, S., and Kim, Y. (May 26, 2017). "Applicability of Net-Section Collapse Load Approach to Multiple-Cracked Pipe Assessment: Numerical Study." ASME. J. Pressure Vessel Technol. August 2017; 139(4): 041208. https://doi.org/10.1115/1.4036656
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