Bionic Construction Of Brake Disc’s Surface Structure And Simulation Analysis Of Its Performance

The vehicle safety is the principal consideration in automobile design and manufacture, and braking performance reliability is the main factor to determine the automotive safety standards. At present, mainly via three methods to improve the brake disc’s performance, as changing the brake disk’s friction material, adopting the surface modification, and modifying the brake disc surface structure. However, it still exists some obvious shortages, for example, the longer research and development cycle, the higher production cost, the more defective wear-resisting performance. With macro groove geometry morphology on the surface of the brake disc, its coefficient of friction and wear properties are significantly higher than ordinary brake discs. Therefore, the crucial point of this research is designing brake disc with particular morphology structure. In this thesis, the brake disc’s surface structure was biomimetically designed with the purpose of improving the brake disc’s performance.Firstly, brake disc’s surface structure was bionic constructed. By referencing similar methods of establishing bionic shape based on other insects’ non-smooth surface structure, according to the excellent wear-resisting properties deriving from locust’s, different bionic models of the ventilated brake disc with pit and groove structure surface were established. Secondly, stress field of bionic structure brake discs was analyzed. Based on Workbench, we analyzed the braking time and the stress distribution between brake discs designed particular surface structure and brake pad under different initial velocity. The result presented that the variation of the bionic brake disc’s surface structure performs significant effect on braking performance and wear resistance. Brake disc with straight groove surface exhibits relatively better braking performance and wear resistance. Once more, thermal-stress coupled of bionic brake discs was analyzed. According to the thermal analysis theory, based on Workbench, transient temperature field analysis of the bionic brake disc during the braking process under different initial velocity was analyzed. The result showed that bionic brake disc with circle pit non-smooth surface structure presents excellent heat dissipation ability, which is beneficial to improve the brake performance. It originates from the circle pit surface can store air and dissipate heat, thus reducing the thermal fatigue and thermal wear caused by high temperature. Lastly, brake disc’s surface micro-structure was bionic optimization constructed. In view of the above simulation, the model was optimized via combining the geometric features of groove structure which has relatively excellent braking performance and wear resistance with the pit structure which has excellent heat dissipation ability. The attained brake disc presents excellent braking performance, wear resistance and heat dissipation performance.Based on the wearable theory of insect non-smooth surface and simulation analysis method, this study illuminated the influence of bionic brake disc’s surface structure on braking performance, wear resistance and heat dissipation. This research provides a theoretical basis for designing bionic brake discs with excellent braking performance and wear resistance property.