当需要汽轮机在带负荷—甩负荷和启—停工况运行时,无论在其设计阶段还是在运行阶段,对汽轮机转子材料进行低周疲劳的评估都是一个应当解决的至关重要的问题.在设计阶段不可能解决这个问题,因为设计师不可能预见到汽轮机所有的运行工况,同时也正如实践所表明的那样,任何一种工况的每次具体实施均不可能与另一次完全一致.在这种 When turbines are required to operate with load-dump load and start-stop conditions, low-cycle fatigue assessment of turbine rotor materials is a crucial issue that should be addressed both in the design phase and in the operational phase. This problem can not be solved during the design phase because it is impossible for a designer to anticipate all the operating conditions of the steam turbine and, as the practice has shown, that every concrete implementation of any one of these conditions can not be exactly the same as the other .In this kind of