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本文应用有限元分析了ＳＧ高压水室在典型负荷波动下的热应力，根据所计算出的峰值应力循环幅，引用低周疲劳设计曲线，对结构的低周疲劳用ＡＳＭＥ规范进行了评估，发现ＳＧ在典型载荷循环下不产生显著的低周疲劳损伤。
In this paper, the thermal stress of SG high pressure water chamber under typical load fluctuation was analyzed by finite element method. Based on the calculated peak stress cyclic amplitude, low-cycle fatigue design curve was used to evaluate the low-cycle fatigue ASME code. SG does not produce significant low cycle fatigue damage under typical load cycles.