Numerical Simulation Of Thermal-Mechanical Coupled Process In Train Braking

The department of railroad brings forward the great target of "high speed, heavy load" to face the challenge of the new economic ages. When we talk about "high speed" or "heavy load", brake cannot but be mentioned. The target will not come true, even with good line or efficient traction, if the problems of brake are act solved wellCurrently, we are usually puzzled by wheel flat, disc crack in brake system, which influence the quality of running badly. Now one part of the system in many physical fields, by means of non-coupling, is often adopted to study on braking process. But braking process depends on the brake force produced by mutual action of every components, and it is a complicated thermal-mechanical coupling problem related to large displacement, dynamic contact, therefore contact among every components must be thought over on studying braking process, and it is the same with strong coupling between temperature field and displacement field.As a part of the civil 863 plans, two multiple-contact models for two kinds of braking system are built in the paper, in which contact fields are described as Coons surfaces, initial velocity is programmed in Fortran. Thethermal-mechanical coupling braking processes are simulated for the first timeby MSC.MARC, the general-used nonlinear FEM software. Time distributions of the velocity, the stress and the temperature of the components under various initial velocity and brake force are obtained, which offer theoretic gist to study the life of the wheel, the disc and so on.Because of the complexities of the studied problems, only the beginning of the whole braking process can be simulated under the conditions of the current hardware. The whole braking process will be simulated effectively with better hardware provided.