제동디스크의 코팅 두께에 따른 열응력 2D 해석 모델 연구

초록

A braking system is a structure in which a braking force is generated by friction between friction material and a braking disc. Wear occurs due to braking action, which causes the occurrence of fine dust, which has recently become an issue. Eco-friendly research is being actively conducted domestically and abroad to reduce fine dust. In order to reduce fine dust, a coating layer should be formed on the surface of the braking disc in various ways to reduce wear and maintain braking performance. However, high heat is generated due to friction, and as a result, heat is accumulated on the surface of the braking disc, thereby generating high thermal stress. Research is needed to minimize thermal stress because the difference in the thermal expansion rate between the coated layer, the base material part, and the bond layer that bonds the two layers generates higher thermal stress, which greatly affects the braking disc. Therefore, in this study, the thermal stress according to the thickness of the coating layer and bond layer was derived from the coating surface of a braking disc through thermal-structure linkage analysis. The correlation between the coating thickness and thermal stress was analyzed. A micro-structured 2D analysis model is proposed to correlate the coating layer, bonding layer, base material parts, and materials with various thicknesses and to save analysis time. The thermal stress of each layer was derived based on braking test data. Using the analysis of the results, a model for optimization was obtained.

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