Closure Effect ofⅠ+ⅡMixed-mode Crack for EA4T Axle Steel  

作　　者：Shuancheng Wang Bing Yang Shuwei Zhou Jian Li Shoune Xiao 

机构地区：[1]State Key Laboratory of Rail Transit Vehicle System,Southwest Jiaotong University,Chengdu 610031,China [2]Institute of Metal Forming,RWTH Aachen University,52064 Aachen,Germany

出　　处：《Chinese Journal of Mechanical Engineering》2024年第4期327-341,共15页中国机械工程学报（英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant No.52375159);National Railway Administration of China (Grant No.KF2023-025);the Independent Research Project of the State Key Laboratory of Traction Power (Grant No.2022TPL_T03)。

摘　　要：The crack-closure effect is a crucial factor that affects the crack growth rate and should be considered in simulation analysis and testing.A mixed-mode I+II loading fatigue crack growth test was performed using EA4T axle steel specimens.The variation of the plastic-induced crack closure(PICC)effect and the roughness-induced crack closure(RICC)effect during crack deflection in the mixed-mode is examined in this study.The results show that the load perpendicular to the crack propagation direction hinders the slip effect caused by the load parallel to the crack propagation direction under mixed-mode loading,and the crack deflection is an intuitive manifestation of the interaction between the PICC and RICC.The proportion of the RA value change on the crack side caused by contact friction was reduced by the interaction between PICC and RICC.The roughness of the crack surface before and after the crack deflection is different,and the spatial torsion crack surface is formed during the crack propagation process.With the increase of the crack length,the roughness of the fracture surface increases.During the crack deflection process,the PICC value fluctuates around 0.2,and the RICC value is increased to 0.15.

关 键 词：Crack closure Crack deflection Plasticity-induced closure Roughness-induced closure Interaction mechanism 

分 类 号：TG142.1[一般工业技术—材料科学与工程]