轮胎与沥青路面微观摩擦接触特性的分子动力学模拟

发布时间：2018-01-18 07:10

  本文关键词：轮胎与沥青路面微观摩擦接触特性的分子动力学模拟　出处：《工程科学学报》2016年06期 　论文类型：期刊论文

  更多相关文章： 轮胎 沥青路面 摩擦 接触 分子动力学模拟

【摘要】：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.
[Abstract]:In order to accurately characterize the contact characteristics of micro friction between tire and road surface and the effect of molecular force. Three dimensional monomer model and interface contact model of tire (polyisoprene) and aggregate (silica) were established by molecular dynamics simulation. The microstructure and contact characteristics of tire and aggregate were studied on nanometer scale. The simulation results show that the chain polyisoprene molecular chain is spiral structure, the molecular gap is large, and it is easy to produce large deformation. Silica is a typical brittle material with a flat surface. The interfacial contact model is based on silica, on which the polyisoprene single chain glides at a uniform rate. The distance between them is 0.5 nm. The simulation results show that the friction coefficient decreases with the increase of velocity, and the variation trend is the same as the experimental results, which proves that the simulation results are effective.
【作者单位】： 北京科技大学国家材料服役安全科学中心;
【基金】：国家自然科学基金资助项目(51308042,41372320)
【分类号】：U461.51
【正文快照】： 沥青路面是我国道路工程中使用最为广泛的路面类型.据交通运输部公布的数据:截至2009年6月,我国高速公路通车里程达7.5万km,其中90%以上采用沥青路面[1].车辆行驶过程中,轮胎与沥青路面接触界面所产生的摩擦力是控制行车轨迹与速度的本源,高速公路通常要求具有较好的抗滑性能(，

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