This paper describes examinations of the screening criteria of fracture assessment methods for pipes having a circumferential surface flaw. The failure mode screening criteria for ferritic steel pipes are defined in Appendix E-11 of the Rules on Fitness-for-service for Nuclear Power Plants  (hereinafter, the FFS Codes) of the Japan Society of Mechanical Engineers (JSME) and ARTICLE C-4000 of ASME Section XI  (hereinafter, ASME Sec. XI). However, these screening criteria were assessed under limited conditions; they are not intended for detailed evaluation. Essentially, the fracture mode depends on a stress-strain curve, a J-R curve, flaw shape (length and depth), pipe shape (R/t), etc. First, among these parameters, these that have a large effect on fracture strength evaluation were selected. The important parameters for fracture strength are a stress-strain curve, a J-R curve, flaw depth. Next, failure modes according to these parameters were classified. Finally, a screening method to determine whether the failure mode is Limit Load (LL) or Elastic-Plastic Fracture Mechanics (EPFM) for all pipe materials was proposed. The proposed method is a general method not limiting the applicable pipe materials.
Screening Criteria of Fracture Assessment Methods for Pipes Having a Circumferential Surface Flaw
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Machida, H, & Kato, T. "Screening Criteria of Fracture Assessment Methods for Pipes Having a Circumferential Surface Flaw." Proceedings of the ASME 2017 Pressure Vessels and Piping Conference. Volume 1B: Codes and Standards. Waikoloa, Hawaii, USA. July 16–20, 2017. V01BT01A052. ASME. https://doi.org/10.1115/PVP2017-65314
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