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research-article

APPLICABILITY OF NET-SECTION COLLAPSE LOAD APPROACH TO MULTIPLE-CRACKED PIPE ASSESSMENT: NUMERICAL STUDY

[+] Author and Article Information
Myeong-Woo Lee

Korea University, Mechanical Engineering Anam-Dong, Sungbuk-Ku, Seoul 136-701, Korea
lee-mw@korea.ac.kr

So-Dam LEE

Korea University, Mechanical Engineering Anam-Dong, Sungbuk-Ku, Seoul 136-701, Korea
faireunshow@korea.ac.kr

Yun-Jae Kim

Korea University, Mechanical Engineering Anam-Dong, Sungbuk-Ku, Seoul 136-701, Korea
kimy0308@korea.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4036656 History: Received October 12, 2016; Revised April 26, 2017

Abstract

In this paper, applicability of net-section collapse load approach to circumferential multiple-cracked pipe assessment is investigated using finite element 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 systematic parametric study is performed using 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 more important role and that existing net-section collapse load expression can be potentially non-conservative. Idealization to symmetrical cracks based on the deeper crack is proposed.

Copyright (c) 2017 by ASME
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