沥青路面结冰条件下抗滑性能

利用有限元软件ANSYS/LS-DYNA建立轮胎与路面接触的动力有限元模型,同时考虑轮胎与路面的动态摩擦作用,分析不同温度工况条件下结冰沥青路面的抗滑性能.结果表明：轮胎的速度和动能随时间呈现倒S形的减小趋势,轮胎胎面由于橡胶的粘弹性特性,其速度出现以轮胎运动速度为平衡位置的剧烈震荡现象;轮胎的速度随着摩擦系数的增大衰减越快,路面结冰时轮胎的速度衰减幅度以及胎面摩擦力都明显小于干燥路面,而制动距离则刚好相反;由于轮胎与路面的相互作用,胎面的摩擦力呈现抛物线变化趋势,最大摩擦力明显小于干燥路面.

Skid-Resistance Performance of Asphalt Pavement Under Ice Condition

A dynamic finite element model about tire contact with pavement has been established by using of the finite element software ANSYS/LS-DYNA.In this model,the dynamic friction between tire and road has been considered.The anti-sliding performance of asphalt pavement under ice condition in deferent temperature has been analyzed using this model.The results show that： tire speed and kinetic energy shows an inverted ＂S＂ decreasing trend with time.While as the viscoelastic properties of rubber,the speed of tire severely vibrates at the equilibrium position of tire speed.The tire speed decreases faster as the friction coefficient increases.The tire speed reducing speed and magnitude under ice condition is obviously smaller than that on dry road condition.And the tread friction force under ice condition is also smaller than that on dry road condition,while the tire braking distance is just opposite.Because of the interaction between tire and pavement surface,the tread friction force present parabolic trends,and the maximum friction force of tread under ice condition is smaller than that on dry road condition.