柴油机受热零件的低周热疲劳寿命预测

本文首先分析船用柴油机热载荷的加载情况，然后确定强载零件的应力－应变迟滞循环；在此基础上用应变范围区分理论和滞回能范围理论，预测受热零件的低周热疲劳寿命。并和因低周热循环损坏的机器零件进行了比较，说明两个方法都具有一定的精确性。这是由于二者都考虑了疲劳和蠕变的交互作用。

Low Cycle Fatigue Life Prediction of Diesel Engine Heating Components

In this paper the thermal load condition of marine diesel engine is analysed, then the stress-strain hysterisis cycles are determined. On this basis the low cycle fatigue lives of heating components are calculated by the Strain-Range Partitioning Method and the Hysterisis Energy Method. By comparing the calculated results with the damaged component of a test machine due to starting and stopping in practical application, it is verified that both methods have a certain accuracy, because both are considered the interaction of fatigue and creep. During calculating and testing, the equivalent temperature of thermal fatigue and high temperature low-cycle fatigue is the maximum temperature T_2 and the stress-strain cycle is according to peripheral stress and strain, because the components are similar to the axisymmetric body.