Applicability of Net-Section Collapse Load Approach to Multiple-Cracked Pipe Assessment: Numerical Study

Myeong Woo Lee, So Dam Lee, Yun-Jae Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Article number041208
JournalJournal of Pressure Vessel Technology, Transactions of the ASME
Issue number4
Publication statusPublished - 2017 Aug 1


  • finite element damage analysis
  • multiple-cracked pipe
  • Net-section collapse load approach
  • stress-modified fracture strain

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Mechanics of Materials
  • Mechanical Engineering


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