An ezperimental study on bending fretting fatigue characteristics of LZ50 railway azle steel
Axle is one of the key components with regard to safety for railway vehicles.Failure analysis results showed that a complicated fretting fatigue damage,which occurred at the interference fit interface between wheel hub and axle induced by alternated vertical bending loads,reciprocating torsional loads and lateral oscillating loads,was one of the most important reasons for the failure of the railway axle.In this paper,bending fretting fatigue tests of LZ50 railway axle steel was carried out on a hydraulic fatigue tester with a special clamp system.A contact configuration of plate fatigue specimen against 52100 steel cylinder pad was used in the bending fretting fatigue tests.The S-N curve of LZ50 steel under bending fretting fatigue was built by serial tests.The bending fretting fatigue cracks were observed and analyzed by optical microscopy (OM) and scanning electron microscopy (SEM,Quanta 2000) with energy dispersive X-ray spectrum (EDX,EDAX-7760/68 ME).The experimental results showed that the fatigue cracks which easily appeared at the upper surface of the plate specimen initiated and propagated along a direction of in about 15-20° to the surface at the beginning stage,and then the cracks turned to perpendicular direction due to the control stresses transformed from fretting contact stresses to plain fatigue stresses.In addition,the fretting fatigue source usually initiated at the sites of the inclusions of steel in fretting contact zone.With the increase of bending stress,the number of cycles of fretting fatigue fracture was dramatically decreased.
Fatigue damage Fretting fatigue Bending fretting Railway azles
J.F.Peng M.X.Shen J.F.Zheng X.Z.Lin C.Song G.Z.Kang M.H.Zhu
Tribology Research Institute,Traction Power State Key Laboratory,Southwest Jiaotong University,Cheng Department of Applied Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610031,China
国际会议
成都
英文
495-499
2009-10-16（万方平台首次上网日期，不代表论文的发表时间）