Ratchetting Behaviour of High Strength Rail Steel under Uniaxial and Biaxial Cyclic Loadings
An experimental study was carried out to investigate the cyclic deformation characteristic and ratchetting behaviour of a hypereutectoid high strength rail steel subjected to uniaxial and non-proportionally compression-torsion cyclic loadings. The cyclic deformation characteristic of the material was investigated under uniaxial symmetrical strain cycling. The uniaxial ratchetting was studied under asymmetrical stress cycling with different mean stresses and stress amplitudes and the multiaxial ratchetting was investigated under stress cycling with different axial stresses, equivalent stress amplitudes and non-proportional loading paths. It is shown that the responding stress amplitude decreases with cyclic number, i.e., the steel exhibits cyclic softening under uniaxial symmetrical strain cycling. The uniaxial ratchetting strain increases with mean stress and stress amplitude, but behaves differently under tension and under compression. The multiaxial ratchetting behaviour strongly depends not only on the axial stress and equivalent shear stress amplitudes but also on the non-proportional loading path. Additionally, the material reaches cyclic stabilization after a certain number of loading cycles under both uniaxial and multiaxial stress cyclings. These results can be applied to develop a reliable multiaxial cyclic plasticity model for investigating the degradation behaviour of the high strength rail steel under cumulative wheel-rail contact.
Ratchetting high strength rail steel non-proportionally multiaxial loading cyclic loading.
Chung Lun Pun Qianhua Kan Peter Mutton Guozheng Kang Wenyi Yan
Department of Mechanical and Aerospace Engineering,Monash University,Clayton,VIC 3800,Australia School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu,610031,Peoples Republic o Institute of Railway Technology,Monash University,Clayton,VIC 3800,Australia
国际会议
北京
英文
1-10
2013-06-16(万方平台首次上网日期,不代表论文的发表时间)