A Prediction Model for Low Cycle Fatigue Crack Initiation under Axial Loading
A prediction model for low cycle fatigue crack initiation was proposed,based on damage mechanics theory,which indicated the relation of equivalent value d of low cycle fatigue crack initiation to stress attenuation percentage △S/S.Then,parameter d will be calculated if △S/S is given,and the corresponding cyclic life is initiation life of fatigue crack.To validate the model,a group of 10CrNiMo structural steel specimens with a round-section were tested through low cycle fatigue test controlled by constant strain under axial loading,and the results manifested that the model is dependable and applicable; and the error of d to really measured value is not more than 5.0%; when the total strain amplitude is 0.6%,d is close to 2.0mm and the initiation life is approximately 900 cycles,which is nearly 80% of the entire life.
Low cycle fatigue Crack initiation Prediction model Equivalent value of crack initiation Initiation life
Zhang Yajun Gao Lingqing Wang Chunfen
Luoyang Ship Material Research Institute,Luoyang 471023,China
国际会议
西安
英文
1-6
2012-10-01（万方平台首次上网日期，不代表论文的发表时间）