Research On Disc/pad Contact Friction Process Simulation With Third Body In High Power Brake

High power disc brake as an important mechanism to ensure the safe operation of large-scale shaft machinery and equipment.In the process of braking,friction between rough interface of brake disc and brake pad,the internal third body produced by the combined action of the force and heat in friction material,as well as a large amount of external third body,accumulated in the gap of the braking interface together,and participated in the friction together It has a very important influence on the friction and wear properties of brake materials,as well as the brake performance.In this paper,the contact friction process of the third body of the brake disc is simulated,the morphology,movement and distribution of the internal and external third body in the process of friction and contact,as well as the vibration of braking interface under different working conditions were studied.This paper accurately simulates the contact surface friction state of the real three body contact,explores the effect of the two third body particles on the three body friction system in the braking process,and then provides the theoretical basis for improving the working performance of the brake friction pair and the service life of the high-power brake.(1)Based on the fractal theory,the micro rough surface morphology of the brake disc and brake pad of the high-power brake under the real working condition is simulated,the internal contact friction model and the external contact friction model with hard particles are established by using the three body flow circulation mechanism,and the dynamic contact friction process of two types of high-power brake disc and brake pad interface is simulated respectively.(2)Starting from the process of hard particles peeling off to form three bodies,this paper studies the formation rule of the internal third body in the friction process between the brake disc and the brake disc containing hard particles,and studies the damage mechanism of the external third body in the friction interface by adding the soft copper third body in the friction system.And the motion characteristics and distribution of the two types of the third body in the friction interface gap.The formation mechanism of different third bodies at the friction interface is revealed.(3)According to the real friction state,combined with multiple working conditions,the friction process of the third body friction system with internal hard particles and the third body friction system with external copper particles is analyzed.By analyzing the non-linear change of the internal stress field and strain field of the three body friction system,the contact state of the third body particles with the brake disc and the brake plate and the micro friction mechanism of the two third body particles against the friction system are studied respectively.(4)By changing the braking load and braking speed to simulate the contact friction process of the three bodies,the vibration amplitude curves of the two third bodies on the friction braking interface are extracted respectively.After data processing,the phenomenon of the average amplitude and the amplitude fluctuation are integrated and analyzed to study the role of the two three bodies in the contact friction of the three bodies.The research results of this paper reveal the mechanism of three-body contact friction during the braking process of high-power disc brakes,which has important theoretical significance and application value for studying the effect of three-body contact friction on the brake braking effect,and further reveals the working conditions of high-power braking.The research on the mechanism of friction and wear provides a theoretical basis.