This paper proposes methods to calculate stress ranges for fatigue assessment in a component subjected to cyclic thermal loads. The aim was to perform the calculations with a PC of moderate power within a reasonably short computation time. Three simplified methods for defining stress ranges were proposed in place of the method in the ASME Section III procedures. A cyclic thermal transient test performed on a 304ss cylinder was simulated. To validate the proposed simplified methods, the simulation results were compared with those of the previously performed thermal transient test. The stress range distribution was visualized using the graphic user interface of a commercial finite-element analysis code. The maximum elastic stress ranges achieved using the four methods at the inner surface of the thick cylinder specimen agreed well with each other. In addition, these maximum stress ranges were consistent with the distribution of the cracks observed in the test.

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