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

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外文摘要：The crack-closure effect is a crucial factor that affects the crack growth rate and should be considered in simula-tion 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 inter-action 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.

外文关键词：

Crack closureCrack deflectionPlasticity-induced closureRoughness-induced closureInteraction mechanism

作者：

Shuancheng Wang、Bing Yang、Shuwei Zhou、Jian Li、Shoune Xiao

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作者单位：

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

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

基金：

National Natural Science Foundation of ChinaNational Railway Administration of ChinaIndependent Research Project of the State Key Laboratory of Traction Power

项目编号：

52375159KF2023-0252022TPL_T03

出版年：

2024

DOI：

10.1186/s10033-024-01061-1

中国机械工程学报

中国机械工程学会

中国机械工程学报

CSTPCD

影响因子：0.765

ISSN：1000-9345

年,卷(期)：2024.37(4)