Abstract: The Strain .Energy Model (SEM), including both Strain Energy Partitioning (SEP) and Strain Energy Frequency Separation (SEFS) by authors which are the synthesis and modification of Strain Range Partitioning (SRP), Frequency Separation (FS) and Ostergren Model is presented. By comparison the abilities of the above five methods to predict the creep-fatigue lives of three different strength and ductility materials 1Cr18Ni 9Ti, GH36 and GH33A with three different processings, it would seem that SEP and SEFS have rather better predictiabilities than the others and more significant physical meanings. Finally, the time dependent fatigue fracture of GH33A at 7000C showed the close dependence with the lives of it.

Key words: 镍基合金, 蠕变-疲劳-环境交互作用, 时间相关疲劳, 寿命预测, 应变能模型