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Design Criterion of Fatigue Analysis on Plastic Basis by ASME B&PV Code

[+] Author Affiliations
Arturs Kalnins

Lehigh University, Bethlehem, PA

Norman E. Dowling

Virginia Polytechnic Institute and State University, Blackburg, VA

Paper No. PVP2003-1766, pp. 11-18; 8 pages
doi:10.1115/PVP2003-1766
From:
  • ASME 2003 Pressure Vessels and Piping Conference
  • Pressure Vessel and Piping Codes and Standards
  • Cleveland, Ohio, USA, July 20–24, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-1694-X
  • Copyright © 2003 by ASME

abstract

The paper investigates the current rules for fatigue analysis on plastic basis of the ASME Boiler and Pressure Vessel Code. It addresses the question: When these rules are used for a vessel or component, is it designed with respect to crack initiation or failure? Using available fatigue test data, the question is answered for blunt double-notch plate specimens made of AISI 4340 steel. When the rules are applied to these specimens, it is found that they are designed with respect to the initiation of a crack of a certain length that decreases as the strain range increases. The plate specimens are not designed with respect to failure. It is concluded that for geometries that exhibit a strain range gradient away from the surface, the number of cycles allowed by the current rules includes the initiation phase but not the propagation phase of a fatigue crack. If this result is unsatisfactory, new rules have to be written.

Copyright © 2003 by ASME

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