Simulation study on wheel wear and rolling contact fatigue of heavy-haul freight wagons
This study addresses the evolution law of wheel wear in heavy-haul freight wagons and the rolling contact fatigue behavior of worn wheel profiles across various operational mileages.Utilizing the vehicle-track coupling theory,the Kik-Piotrowski wheel-rail contact algorithm,the Archard wheel wear model,and the Dang Van rolling contact fatigue criterion,a dynamic model of a heavy-haul freight wagon is developed in UM software to investigate evolution patterns of wheel profile wear and rolling contact fatigue damage under different mileages.The results show that when the running mileage of the vehicle reaches 35 000 km,the flange wear of the first and second wheelset is 2.04 and 0.75 mm,respectively.The flange wear of the first wheelset is more severe.The cumulative damage distribution of the first wheelset is broader than that of the second wheelset,while the cumulative dam-age of the second wheelset is higher than that of the first wheelset,which is concentrated at 6～9 mm on the tread.As mileage increases,the wear width of the first wheelset expands,reaching-35～36 mm on the tread.The maximum cumulative damage contact point of the first wheelset from the in-ner to the outer edge and subsequently toward the wheel root.Conversely,then the maximum cumula-tive damage contact point of the second wheelset moves from the outer to the inner edge,then toward the wheel end.The first wheelset exhibits the highest wear,but its rolling contact fatigue damage is lower than that of the second wheelset.An inhibitory relationship between wheel wear and rolling con-tact fatigue damage promotes rolling contact encourages fatigue damage to migrate toward the wheel end.It is recommended to apply wheel or rail lubrication to reduce flange wear in early operations.Af-ter the vehicle runs to 30 000 km,attention should focus on damage around the 5～15 mm region of the middle wheel tread.If necessary,a"grinder"can be employed to increase wheel wear and thereby reduce overall wheel damage.
万方数据
维普
