The High Pressure Institute of Japan has prescribed the Japanese FFS code, HPIS Z101 Level 1, which can evaluate a crack-like flaw without an extensive knowledge of fracture mechanics. Level 2 is currently being studied and will also be prescribed. In HPIS Z101 Level 2, a two-parameter method (FAD: Failure Assessment Diagram) will be adopted. This paper reveals that FACs dependent on the type of materials should be specified. Kr-Lr relations calculated from experimentally obtained Ramberg-Osgood constants of several steels are compared with the FACs of BS7910 Level 2A & API 579 Level 2, R6 Option 1 and ASME N494-3. It is found that the FAC of ferritic steel in ASME N494-3 is pertinent to carbon steels with a marked yield point plateau while the FAC of BS7910 Level 2A & API 579Level 2 is suitable for ferritic steels other than carbon steels such as 0.5Mo, 2.25Cr-1Mo and 2.25Cr-1Mo-0.25V steels. Further, cut-off values dependent on the strength of the material and the plasticity interaction factors for the FAC of carbon steels are proposed.
Failure Assessment Curves (FACs) in Japanese FFS Code, HPIS Z101 Level 2
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Konosu, S. "Failure Assessment Curves (FACs) in Japanese FFS Code, HPIS Z101 Level 2." Proceedings of the ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. Volume 1: Codes and Standards. Vancouver, BC, Canada. July 23–27, 2006. pp. 387-398. ASME. https://doi.org/10.1115/PVP2006-ICPVT-11-93498
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