Differential wear and plastic deformation as causes of squat at track local stiffness change combined with other track short defects

摘要: Squats have become a major problem in the track of many railways. In quest for root causes squats, it is observed that they are occasionally found at locations stiffness changes such as fish-plated insulated joints and switches crossings. Obviously, there should be other factors track, which, together with change, played important roles otherwise will squats all locations. A validated hybrid multibody-finite element model vehicle–track vertical interaction extended to simulate frictional dynamic rolling contact joint order identify factors. Elastic–plastic rail material property taken into account. It short defect preload condition bolts between fishplates head, which large normal longitudinal force variation fishplate end so differential wear an...