Elastic finite element analysis model of coupling friction heat for wheel/rail

Based on Galerkin variation principle, an elastic finite element analysis model of coupling friction heat for wheel/rail was put forward, and the relations between wheel/rail friction heat and rail expanded displacement in touched area, wheel/rail frictional temperature, contact strain and stress.In the model, inertia term and material damping were ignored, temperature field and displacement field were synchronously solved by using coupling equations.Analysis result shows that coupling simulation values are identical with uncoupling computation values for temperature field and displacement field, the sliding displacement direction of rail surface contact node is identical with wheel sliding direction, and the vertical displacement is negative earlier then positive later; the temperature of rail surface contact node rises quickly in contact area, but the durative time of high temperature is very short, rail surface node experiences press strain early and pull strain later in sliding direction, experiences pull strain in vertical direction, the press stress in sliding direction is higher than in vertical direction, and the strain signs in the front and back of contact note are opposite; the vertical high strains are mostly distributed in the tail of half axle of contact area, and the maximum shear strain and stress appear under contact surface.