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 B&PV Code
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Kalnins, A, & Dowling, NE. "Design Criterion of Fatigue Analysis on Plastic Basis by ASME B&PV Code." Proceedings of the ASME 2003 Pressure Vessels and Piping Conference. Pressure Vessel and Piping Codes and Standards. Cleveland, Ohio, USA. July 20–24, 2003. pp. 11-18. ASME. https://doi.org/10.1115/PVP2003-1766
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