凝冰条件下沥青路面与轮胎接触摩擦动力响应分析

Analysis on Dynamic Response Between Asphalt Pavement and Tire Under Glazing-ice Condition

综合考虑轮胎材料超弹性和路面材料的粘弹性、轮胎与路面间的瞬态接触摩擦作用,利用有限元软件ANSYS/LS-DYNA建立凝冰条件下轮胎与沥青路面接触的有限元模型,分析沥青路面动力响应规律.结果表明:凝冰条件下沥青路面路表弯沉在轮胎作用的区域明显增大,在没有直接作用的区域弯沉逐渐减小,且路表弯沉随着摩擦系数的增大而逐渐增大;路表水平剪应力以轮胎作用区域为中心呈反对称分布,且最大水平剪应力在轮胎经过前随着摩擦系数的增大而减小,而在轮胎经过后随摩擦系数的增大而增大.路表竖向应力在轮胎作用的瞬间出现应力集中现象,在非作用区域则很小,竖向应力随着摩擦系数的增大而减小;同时阻尼对凝冰沥青路面力学响应也有着重要的影响.

A finite element model about tire contact with pavement has been established using the finite element software ANSYS/LS-DYNA under the glazing-ice condition .In this model ,the hyper-elastic of tire material and the viscoelasticity of asphalt material have been taken into account ,meanw hile the dynamic friction between tire and pavement has been considered .The pavement dynamic response un-der tire force has been analyzed ,and the results show that ：the pavement deflection in tire contact area increase significantly ,w hile the pavement deflection in tire non-contact area decrease and the deflec-tion increases as the friction coefficient increases .Pavement horizontal shear stress was antisymmetric distribution with tire contact area as center ,and the maximum shear force decreases as the friction co-efficient increases before the tire pass through w hile the maximum shear force increases as the friction coefficient increases after the tire pass through .Pavement vertical stress comes upon stress concentra-tion in the tire contact area ,and w hich increases as the friction coefficient increases ,w hile the vertical force is very small in the non-tire contact area .Meanwhile ,damping has also important impact on pavement mechanical response .