Estimation of fatigue crack growth behavior based on low cycle fatigue properties

摘要：

　　Theoretical models for the fatigue crack growth are established due to the low cycle fatigue properties of the material in which one is based on the plastic strain energy and another one is based on the linear damage accumulation theory.The step length of crack propagation is assumed to be the size of cyclic plastic zone.The crack is treated as a sharp notch with a small curvature radius,avoiding the physically unrealistic singularity at its tip.Theoretical models whose parameters have explicitly physical meaning can be used to predict crack growth at low and intermediate the stress intensity range,ΔK,i.e.stage Ⅰ crack growth rate and stage Ⅱ crack growth rate.Prediction results given by two models are compared with the experimental results for the SAE 1020 steel,the 7075-T6 alloy,the 4340 steel,and the A533-B1 steel.Better agreement between experimental and theoretical results is obtained.

关键词： fatigue crack growth low cycle fatigue plastic strain energy damage accumulation

作者: K.K.Shi L.X.Cai L.Chen C.Bao

作者单位: School of Mechanics and Engineering,SWJTU,Chengdu,610031,China

会议类型: 国际会议

会议名称: International Conference on Airworthiness & Fatigue -7th ICSAELS Series Conference(大飞机安全性能与疲劳国际会议)

会议地点: 北京

会议语种:英文

页码: 71-76

在线出版日期: 2013-03-24（万方平台首次上网日期，不代表论文的发表时间）