Research on High Temperature Low Cycle Fatigue Crack Propagation of 2.25Cr-IMo Steel under Complex Stress State

摘要

The crack propagation law of 2.25Cr-lMo steel with notched cylinder was researched under high temperature low cycle fatigue. The crack propagation life was viewed by fatigue experiment and the equivalent stress-strain on the crack tip was calculated by the ANSYS. The equivalent J-integral range which was computed by equivalent elastic and plastic strain ranges were employed to denote the fatigue crack propagation rate. The results showed that crack propagation law of this material under complex stress state can be characterized by equivalent J-integral ranges and the relation between da/dN and ?J_f is not influenced by the type of notch and the load strain range.