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In this paper analytical methods to evaluate multiaxial low-cycle fatigue lives for pressure vessel components have been appraised and the sources of conservatism highlighted. For this purpose, a sample design problem involving a pressure vessel component fabricated from a coded structural alloy subjected to a specified set of loading conditions has been evaluated for fatigue. The local strain approach has been used as a basis for assessing two methods of fatigue evaluation in the low-cycle fatigue regime: (1) the ASME Code, and (2) the Japanese MITI Code. A possible extension of the code procedures to include hydrostatic effects has been recommended.
low-cycle fatigue, ASME code, MITI code, multiaxiality, elastic plastic analysis, strain concentration factor, peak stresses, linearized stresses
The University of Vermont, Burlington, VT