在汽轮机调峰运行方式中,由于启动或负荷大幅度波动,都将在汽缸壳体等部件上产生较大的热应力。其应力分布非常复杂,而且有超过材料屈服应力的应力峰值。这些屈服后应力峰值的有效确定,直接关系到机组安全运行与寿命的正确评估。本文就调峰机组汽缸壳体热应力测试结果,根据工程塑性理论,进行了分析处理。讨论了导致汽缸翘曲变形和疲劳损伤的力学因素,为制定机组调峰运行控制指标,提供了力学试验依据。 Peak steam turbine operation mode, due to start or load fluctuations, will be in the cylinder housing and other components have a greater thermal stress. The stress distribution is very complicated, and there is a stress peak exceeding the yield stress of the material. The effective determination of these post-yield stress peaks is directly related to the correct assessment of the safe operation and life of the unit. In this paper, the peak stress test results of cylinder shell thermal stress test unit, according to engineering plasticity theory, analysis and treatment. The mechanical factors leading to warpage and fatigue damage of the cylinder are discussed. The basis of the mechanical test is provided for the control index of peaking operation.