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采用随机有限元方法,针对某燃气涡轮盘-片进行了热流固耦合及接触热弹塑性分析,得到了随机应力应变响应;基于概率Miner损伤准则和应变场强法,运用K.N.Smith疲劳损伤公式及Manson-Succop形式热强综合参数蠕变方程计算了涡轮盘-片的疲劳蠕变寿命;据此分析了影响疲劳和蠕变损伤的各种因素,提出了装置使用和维护方面的建议.分析结果接近实际,证明该方法不失为目前为止较好的预测涡轮盘-片剩余寿命的新方法.
A stochastic finite element method was used to analyze the thermo-mechanical coupling and contact thermal elasto-plasticity of a gas turbine disk-sheet. The random stress-strain response was obtained. Based on the probability Miner damage criterion and strain field strength method, KNSmith fatigue damage formula and Manson-Succop form heat-strength comprehensive parameter creep equation was used to calculate the fatigue-creep life of the turbine disk-sheet. Based on the analysis of the various factors that affect the fatigue and creep damage, the suggestions on the use and maintenance of the equipment were put forward. Close to reality, this method is proved to be a better method for predicting the remaining life of turbine disk.