Finite Element Mesh Automatic Modeling And Hydroplaning Analysis Of Radial Tire

With the rapid development of China's automobile industry and highway transportation,the demand of tires have greatly increased.Radial tires have been the mainstream of the global market with their excellent performance.The pattern of radial tires is usually designed into a variety of complex structures to meet different requirements,which makes the finite element modeling of tires difficult.At present,the modeling method is to create three-dimensional geometric modeling according to the two-dimensional pattern design drawing,and then use the finite element pre-processing software for mesh generation.This process takes a long time and needs some experience,and the quality of the mesh is difficult to guarantee.In this paper,a method of creating pattern model based on mapping and projection was proposed,which realized the process of directly obtaining 3D finite element model from 2D design drawing,improved the modeling efficiency and obtains high quality mesh.In view of the safety problem of tire driving on wet and slippery road,it was analyzed that the structure of tread pattern is an important factor affecting the wet grip of tires on wet road.The Fluid-structure interaction model was established to simulate the tire hydroplaning,and the impact of different tread patterns on tire hydroplaning performance was investigated.Firstly,the current finite element modeling strategy of complex tread pattern tire was summarized.Combined with the design and production process of tires,the problems existing in tread pattern modeling process were analysed,and the method of creating tread pattern model based on mapping and projection was proposed.Then,the finite element model of tire hydroplaning was established by CEL method,in which the rubber parts were simulated with YEOH model while the rebar elements were to model the rubber-cord composites.Lagrange method was utilized to describe the deformation and movement of tire,Euler method was utilized to simulate the movement of water,and water flow model was selected to simulate tire hydroplaning.By deducing the mapping equation,the two-dimensional structure diagram of tread pattern was expanded in axial and circumferential directions.Using AutoLISP language and DCL language,the preprocessing program of pattern structure diagram was developed to assist the mesh generation of two-dimensional diagram.With the help of the secondary development technology and mesh processing function of HyperMesh,the two-dimensional mesh elements were classified based on the pattern groove type,and the node and element information of the mesh was extracted,which is prepared for the later establishment of the pattern three-dimensional mesh modelThe automatic generation program of 3D finite element model of pattern was developed by MATLAB,which mainly included three modules:3D node coordinate solution,spatial node coordinate restoration and pattern mesh generation.Firstly,the 3D node coordinates of the pattern were obtained by projection from the expanded nodes of the pattern structure diagram,and then the spatial node coordinates of the actual pattern model were obtained by coordinate restoration.Secondly,the nodes were numbered according to the mesh hierarchy,and the elements were connected according to the right-hand rule to generate the pattern 3D mesh model.Finally,a parametric interface were developed to adapt to different complex patterns to enhance the generality of the program.The main body finite element model of 205/55R16 tire was established,and the combined model technology was used to bind it with the pattern finite element model generated by the automatic modeling program to create the tire finite element model with complex pattern.The simulation of tire inflation and self weight loading was carried out in ABAQUS,and the deformation of tire under inflation and self weight conditions,as well as the stress state of rubber material and skeleton material were analyzed.The final simulation results verified the effectiveness of the automatic tire pattern modeling technology.The Fluid-structure interaction model of complex tread patterns with different structures was established,and the hydroplaning simulation was carried out.It was found that the hydroplaning performance of the tire could be improved to a certain extent by designing the slope of the groove bottom of the transverse tread pattern of the same complex tread pattern and setting a certain angle of the groove wall inclination.For the tread patterns of the same structure,the axisymmetric form had better hydroplaning performance than the point symmetry and vertical form.