Tire Tread Wear Prediction Considering The Complex Pattern

The tire is the only part of the car structure in contact with the road,which not only transports the incentive and shock from road,but also directly affects the vehicle's power,reliability and safety performance.The tread wear phenomenon caused by tire rolling will not only affect the tire life,but also reduce the ability to attach,slipping on the wet road surface,generating tire noise and other issues,and even seriously affect the traffic safety.For tire tread wear test,most domestic and foreign tire factory are dependent on long time,high cost of outdoor real vehicle test at present,so the use of finite element analysis method for tire tread wear prediction is very important.In order to accurately describe the contact and wear characteristics between tread rubber and pavement,thesis designs and completes the test of tread friction behavior and wear behavior firstly.According to the experimental data,the rubber friction model and the wear model suitable for the tires in thesis are established respectively.For the friction model,the slip curve is validated by introducing the friction model of ABAQUS user subroutine interface(FRIC,VFRIC)to prove the reliability.For the wear model,the parameters are fitted by the exponential wear model which has high correlation coefficient to prove the reliability.Then,thesis introduced the method of establishing tire finite element model based on INP file,including the identification of material model parameters and the verification of complex pattern tire model.The steps of modeling the longitudinal tread and the treadmill are described in detail.At the same time,the tensile stress of the tire rubber material and the skeleton material is obtained to fit the material parameters according to the Yeoh model.And the accuracy of complex pattern tire model is verified,which includes static stiffness test and steady state test and appears the ideal result.Based on the established finite element model,tread wear prediction is carried out by combining implicit adaptive mesh wear technique and explicit dynamic analysis method with friction model developed by user subroutine interface.ABAQUS secondary development is using the Python language.The friction dissipation power and the tread wear depth are calculated and the simulation results show that distribution is consistent with the actual situation,which improve the validity of finite element method to predict the tire wear.And two simulation methods are compared from three aspects:solving strategy,model precision and simulation result,and the advantages and disadvantages of each other are analyzed in detail.Finally,thesis optimized the tire wear preliminarily.Through orthogonal experiment design,thesis explored the beltbar layer cord angle and tread depth on the influence of friction dissipation power,and compared the stress distribution of the beltbar layer before and after the optimization,in a theoretically explained the influence caused by the beltbar layer cord angle to tread wear.By DSA sensitivity analysis,thesis obtained the sensitivity of the grounding area pressure with the tread material parameter CIO.The grounding area pressure and tread material parameter is related positively,and reduce C10 can reduce the tread wear.