Research On Surface Structure And Wear Performance Of Bionic Brake Pads

As one of the most important safety components in the braking process of a car,brake pads often need to be replaced when they reach one-third wear during the driving process,in order to ensure the braking performance.At present,the brake pads are mainly changed by changing the composition of the brake pad material ratio in order to achieve the purpose of wear resistance,but there is a long development cycle,wear resistance is not ideal and other shortcomings.In this paper,we use bionics to extract the characteristics of three different parts of the surface of the step armour shell and combine the non-smooth surface texture with the brake pad structure in order to reduce the wear of the brake pads and thus improve the wear resistance and service life of the brake pads.This paper firstly constructs a bionic brake pad surface structure,based on the excellent biological characteristics of the non-smooth surface of the step armour shell,and analyses and observes the microscopic morphology of different parts of the shell through a 3D super depth of field observation system,and then designs a bionic brake pad with crater,stripe and grid features according to the 3D software.Secondly,the wear quality curves of ordinary brake pads and the three types of bionic brake pads were compared through friction and wear experiments,and it was concluded that the texture structure with the best wear resistance was striped.The wear quality of striped brake pads is 1.50 g lower than that of ordinary brake pads,which is 64.66% lower than that of ordinary brake pads,with the best wear resistance performance.This ensures that the brake friction coefficient is within the rated range and at the same time improves the wear resistance of the brake pad.The brake pads with bionic structure were then subjected to finite element analysis,and the stress field analysis was carried out using finite element simulation analysis on brake pads with non-smooth surface structure,the results show that the bionic brake pads can make the force distribution on the contact surface more uniform,and the wear resistance is better than that of ordinary brake pads.The maximum stress of the striped brake pad with a width of 4mm and a pitch of 6mm is 49.67% lower than that of the ordinary brake pad.The transient temperature field analysis of the bionic brake pad shows that the striped and gridshaped brake pads exhibit better heat dissipation performance,which is due to the fact that the striped and grid grooves can achieve rapid heat exchange between the brake pad and air,thus effectively reducing the thermal friction wear caused by rapid temperature rise.Based on the insect non-smooth surface wear theory,the brake pads and brake discs are improved by means of simulation and experiments,which reduce the wear of the brake pads without affecting the brake friction coefficient,which is of great significance to improve the braking performance of the brake pads.