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

Chinese Journal of Mechanical Engineering, vol. 37

Abstract

Abstract 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 R A 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.

Authors 5

1. Shuancheng Wang

   Southwest Jiaotong University

   Affiliation as printed

   State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu, 610031, China

2. Bing Yang corresponding

   Southwest Jiaotong University

   Affiliation as printed

   State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu, 610031, China

3. Shuwei Zhou Aachen Institute of Metal Forming

   RWTH Aachen University · Southwest Jiaotong University

   Affiliation as printed

   Institute of Metal Forming, RWTH Aachen University, 52064, Aachen, Germany

   State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu, 610031, China

4. Li Jian

   Southwest Jiaotong University

   Affiliation as printed

   State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu, 610031, China

5. Shoune Xiao

   Southwest Jiaotong University

   Affiliation as printed

   State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu, 610031, China