NDLI: Alternative Acceptance Criteria for Flaws in Ferritic Steel Components Operating in the Upper Shelf Temperature Range

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Gustin, H. L. Cipolla, R. C. Xu, S. X. Scarth, D. A.
Copyright Year	2012
Abstract	The flaw evaluation rules for ferritic vessels in IWB-3610, IWB-3620 and Appendix A of ASME Section XI are based on linear elastic fracture mechanics techniques and were developed primarily for the irradiated reactor pressure vessel beltline region and other low temperature carbon and low-alloy steel applications in which the material exhibits limited or no ductility prior to failure. There are situations in which ferritic steel components operate in the upper shelf temperature range and therefore exhibit significant ductility and increased flaw tolerance. Application of linear elastic fracture mechanics techniques to these cases can be very conservative. In order to address flaw evaluation of ferritic materials exhibiting upper shelf toughness and high ductility, the proposed Code Case N-749 of ASME Section XI was developed and is currently under committee review. This proposed Code Case provides alternate acceptance criteria for situations in which the component is operating in the upper shelf temperature range and therefore has adequate ductility to allow the use of elastic-plastic fracture mechanics techniques.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	17
Ending Page	33
Page Count	17
File Format	PDF
ISBN	9780791855003
DOI	10.1115/PVP2012-78190
Volume Number	Volume 1: Codes and Standards
Conference Proceedings	ASME 2012 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2012-07-15
Publisher Place	Toronto, Ontario, Canada
Access Restriction	Subscribed
Subject Keyword	Temperature Fracture mechanics Reactor vessels Ductility Vessels Alloys Steel Acceptance criteria Carbon Failure Fracture toughness Low temperature
Content Type	Text
Resource Type	Article

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