Low-cycle fatigue life prediction for Waspaloy

Methodologies of correlating and predicting life to failure in low cycle fatigue are investigated for Waspaloy at various temperatures. The viscoplastic material model proposed by Chaboche was initially adopted in order to predict the inelastic behaviour observed in low cycle fatigue. Life predictions under low-cycle fatigue loading conditions for the disc material Waspaloy were investigated with two models, the strain range partitioning method (SRP) and the linear combination of creep and fatigue damage laws. In the SRP rule, decomposition method using a computer modeling for determining the model parameters is proposed. The capabilities of the two models were assessed using strain-controlled LCF test results on Waspaloy.