Probabilistic Critical Fatigue Safety State of the RD2 type axle ofChina railway freight car
Critical fatigue safety state is investigated on RD2 type axle of China railway freight cars.Attention is paid on the grooves near axle boxes,where more fatigue cracks were early appeared evenresult in at least six derailed accidents.Load history was obtained by vehicle dynamics simulationcombining with on-line inspection.Braking loads and effects of maintenance and off-round of wheelsare also incorporated.Semi-elliptical and external circumferential cracks are employed for crackgrowth simulation.Crack shape change and shear stressing of the semi-elliptical crack are taken intoaccount.New crack growth rate modeling in which covers from cracking threshold to toughnessrelated fracture state is applied for residual life evaluation.Critical fatigue safety state is defined as thecrack size from which the axle can be safely operated to next overhaul inspection.Critical crack sizeis estimated step-by-step with the crack shape change.Results show that the external circumferentialcrack is more dangerous than the semi-elliptical crack.Application more than two years in productionverifies that the present assessment is available and reliable.
Fatigue Railway Freight Car Axle Safety
Y.X.Zhao B.Yang M.F.Feng Y.Li M.J.Liu G.X.Song
Institute of Engineering Reliability and safety,State Key Laboratory of Traction Power,Southwest Jia Datong ABC Casting Co.Ltd,Datong,China
国际会议
成都
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）