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Technical Basis for the Incorporation of a Fatigue Crack Growth Threshold Limit Into Appendix A to Section XI

[+] Author Affiliations
Edward Friedman

Bechtel Bettis, Inc., West Mifflin, PA

Russell C. Cipolla

Aptech Engineering Services, Sunnyvale, CA

Joseph M. Bloom

McDermott Technologies, Inc., Alliance, OH

Paper No. PVP2002-1245, pp. 303-305; 3 pages
  • ASME 2002 Pressure Vessels and Piping Conference
  • Pressure Vessel and Piping Codes and Standards
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4650-4
  • Copyright © 2002 by ASME


A recent revision to A-4300 of Appendix A to Section XI of the ASME Boiler and Pressure Vessel Code specifies a limiting threshold value of the stress intensity factor range below which crack propagation under cyclic loading can be neglected. The threshold value decreases with increasing R ratio, where R is defined as the ratio of the minimum to the maximum stress intensity factor. This paper reviews the crack closure phenomenon that is the underlying reason for this effect, summarizes the low-alloy pressure vessel steel test data upon which the threshold limit is based, and proposes an empirical equation for the threshold stress intensity factor range that is a reasonably conservative limit. The threshold equation incorporated into Appendix A will also replace the more restrictive threshold formula currently in Code Case N-643.

Copyright © 2002 by ASME



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