Broken gap is an extremely dangerous state in the service of high-speed rails, and the violent wheel–rail impact forces will be intensified when a vehicle passes the gap at high speeds, which may cause a secondary fracture to rail and threaten the running safety of the vehicle. To recognize the damage tolerance of rail fracture length, the implicit–explicit sequential approach is adopted to simulate the wheel–rail high-frequency impact, which considers the factors such as the coupling effect between frictional contact and structural vibration, nonlinear material and real geometric profile. The results demonstrate that the plastic deformation and stress are distributed in crescent shape during the impact at the back rail end, increasing with the rail fracture length. The axle box acceleration in the frequency domain displays two characteristic modes with frequencies around 1,637 and 404 Hz. The limit of the rail fracture length is 60 mm for high-speed railway at a speed of 250 km/h.

裂隙是在高铁上使用的极其危险的状态，当车辆高速通过该间隙时，车轮-铁轨的猛烈冲击力会加剧，这可能导致铁轨产生二次断裂并威胁行驶安全性的车辆。为了识别钢轨断裂长度的损伤容限，采用隐式-显式顺序法模拟轮钢高频冲击，其中考虑了摩擦接触与结构振动之间的耦合效应，非线性材料和真实几何等因素。个人资料。结果表明，在后轨冲击时，塑性变形和应力以月牙形分布，并随着钢轨断裂长度的增加而增加。轴箱加速度在频域中显示两个特征模式，频率分别为1,637和404 Hz。对于以250 km / h的速度行驶的高速铁路，铁路断裂长度的极限是60 mm。