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.
Design Criterion of Fatigue Analysis on Plastic Basis by ASME Boiler and Pressure Vessel Code
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division April 8, 2003; revision received August 27, 2004. Associate Editor: C. E. Jaske.
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Kalnins, A., and Dowling, N. E. (December 1, 2004). "Design Criterion of Fatigue Analysis on Plastic Basis by ASME Boiler and Pressure Vessel Code ." ASME. J. Pressure Vessel Technol. November 2004; 126(4): 461–465. https://doi.org/10.1115/1.1811105
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