A STUDY OF LOW CYCLE FATIGUE PROPERTIES OF MATERIALS BASED ON THE FUNNEL-SHEET SPECIMENS1)

According to the energy equivalent method, a semi-analytical model of the load-displacement relation for funnel-sheet specimens is proposed to correlate the Ramberg-Osgood parameters and the geometry parameters. The model is validated with the forward-predictions and the reverse-predictions in the finite element analysis. On this basis, a new method is put forward for predicting the low cycle fatigue (LCF) properties of materials by funnel sheet specimens. The LCF properties of the SS316L funnel -sheet specimens are verificated to be agree with the round bar specimens. Therefore, the LCF properties of N18 and SAPH440 at different temperatures are predicted by the method.