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为了精确表征轮胎与路面微观摩擦接触特性及分子作用力效应,利用分子动力学模拟分析方法建立轮胎(聚异戊二烯)和集料(二氧化硅)三维单体模型和界面接触模型,在纳米尺度上研究轮胎和集料的微观构造和接触特性.模拟结果表明:链状聚异戊二烯分子链为螺旋状结构,分子间隙较大,易产生较大变形,而二氧化硅则为典型脆性材料,表面较为平整;界面接触模型以二氧化硅为固定基底,聚异戊二烯单链在其上匀速滑动,二者间距离为0.5 nm.接触界面摩擦特性模拟结果表明摩擦系数随着速度增加而变小,其变化趋势与实验结果相同,证明模拟结果有效.
In order to accurately characterize the microscopic frictional contact characteristics between tire and road surface and the molecular force effect, the three-dimensional model of the tire (polyisoprene) and aggregate (silica) and the contact model of the interface were established by molecular dynamics simulation analysis. The microstructures and the contact characteristics of the tire and aggregates were studied at the nanoscale. The simulation results showed that the molecular chain of the chain polyisoprene was a helical structure with a large molecular gap and a large deformation easily, while the silica was Typical brittle materials, the surface is relatively flat; the interface contact model to silica as a fixed substrate, polyisoprene single chain slides on it uniformly, the distance between the two is 0.5 nm.Friction characteristics of contact interface simulation results show that the friction coefficient with With the increase of speed, the change trend is the same with the experimental result, which proves that the simulation result is effective.