Numerical Simulation Of Anti-sliding Of Tire On Snowy Road In Tunnel Section Of High-cold Region

The friction coefficient is drastically decreased due to the exist of snwo between tire and road which reduces the operational stability and driving safety of the vehicle.Therefore,the anti-sliding mechanical properties of tire on the snowy road becomes a very important and challenging content.In order to solve such complex problems,the commonly used solutions are still traditonal test methods and numerical simulation methods.The traditonal test methods have many uncontrollable factors in the study of these problems,such as different snow mechanical properties,driving conditon in the test,the operaton method of the personnnel and the uneven thickness of the snow cover may cause the test to non-repeatable.In this paper,the structure of tire and the hyperelastic rubber material are considered.The finite element model of the 205/55R16 radial tire is established in ABAQUS.Rebar element?Mooney-Rivlin superelastic material and the rigid element was used to establish the tire.The longitudinal grooves are considered except the detailed tread.Tire model is verified from the perspective of stress level,profile deformation,radial stiffness and ground contact area.By collecting the meteorological information,this paper analysis the influence law of tire pressure between two regions;the material model and material parameters of the snow are determined,and the snow is established with C3D8R element and enhanced hourglass control method.To verify the rationality of the snow model,this paper design a plate load test.It is concluded that the tire pressure in the Chongqing is relatively increased 39.80%-41.21%without any handling of the tire;When snow compression reaches 85%,the unit compression amount shows great resistance and has the mechanical properties of ice.Theoretical and numerical analysis are used to study the interaction property between tire and snow.Firstly,the mechanical model of tire-snow accumulation is deduced,and the interaction mechanism between the two is clarified.Second,two kinds of finite element models of tire and snow road are established to study the contact mechanics.Finally,the influence of snow thickness,load,slip rate and sliding friction coefficient on the anti-sliding mechanical properties of the tire is discussed.It is concluded that the contact pressure is larger where in the middle area of the shoulder and tire contact surface:The increase of the thickness of the snow will reduce the longitudinal traction;The appropriate increase of the load is beneficial to the anti-slip;The sliding ratio of 0.2 can provide large longitudinal traction;Increasing the friction coefficient can increase the longitudinal traction without changing contact area.