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Assessment of the Twice-Yield Method for Elastic-Plastic Fatigue Analysis

[+] Author Affiliations
W. Reinhardt

Babcock & Wilcox Canada, Cambridge, ON, Canada

Paper No. PVP2006-ICPVT-11-93004, pp. 315-323; 9 pages
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 2: Computer Technology
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4753-5 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME


The twice-yield (2 Sy) method was proposed by Kalnins as a convenient method to perform an elastic-plastic fatigue analysis using Finite Element analysis. With this method, only a single loading half cycle needs to be run. However, since the shape of the effective yield surface used in this method deviates from the actual von Mises yield surface, the method may conceivably deviate from the solution obtained by elastic-plastic cycle-by-cycle analysis. This paper aims to evaluate the twice-yield method for elastic-plastic fatigue analysis, which is conventionally done cycle-by-cycle. It compares the predictions of plastic strain from the twice-yield method and cycle-by-cycle analysis using some generic examples with non-proportional loading histories as they are frequently encountered in practice.

Copyright © 2006 by ASME



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