Probabilistic Critical Safety Wheel Wear Sizes of Chinese Railway FreightCars
Critical safety wheel wear size is investigated through considering the fatigue safety effecton RD2 type axle of China railway freight cars.The wheel wear size increase results in a rise of thewheel-rail contact forces,which increase the fatigue stress history of the axle in service.Therefore,the size must be controlled to maintain the axle safety in service before the next overhaul inspection.A field investigation was firstly made on the wear size change regularity.Then,the size relatedwheel-rail impact forces are solved by a non-linear Hertzian contact theory with a vehicle multi-bodydynamic model.In addition,a statistical method is further developed for incorporating the impactforces into the wheelset service load history.Finally,a wear size related critical state equation isestablished for ensuring the axle safety in service.A stationary solution is statistically obtained forthe critical wear sizes with respect to the axle circumferential crack and semi-elliptical crack.It isconcluded that the critical safety wear size should be controlled in the range of 100 mm at thestatistical level of survival probability 0.99 and confidence 95％.
Railway Wheel Wear Fatigue 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）