The Finite Element Simulation And Optimization Design Of Non-pneumatic Tires

The tire is one of the important components of a vehicle.The performance of the vehicle is closely related to the tire.The safety of the tire directly affects the driving safety performance of the tire.Conventional pneumatic tires cannot solve the problem of puncture due to their own structural limitations,so the safety performance of the tires cannot be effectively improved.Compared with pneumatic tires,the non-pneumatic tires adopt an air-free structure,and there is no problem such as puncture tires.The safety performance of the non-pneumatic tires is higher.The pneumatic tires have broad development prospects.In this paper,a C-type hole of non-pneumatic tire with a specification of 2.50-144 was used as the research object.Based on the ABAQUS finite element analysis software,the constitutive models of Mooney-Rivlin,Ogden and Yeoh were used to fit the tensile test data.The 3rd-order model of Ogden was the closest.The Ogden model was used to characterize the rubber material.The three-dimensional finite element model of the non-pneumatic-free tire was established.According to the fracture problem of the support structure and grounding problem in the actual non-pneumatic tire,the support structure and the tread portion of the non-pneumatic tire were simulated.Through simulation analysis,it is found that the support structure of the nonpneumatic tire produces stress concentration phenomenon,and the support structure is easy to be damaged in the stress concentrated part;the tread grounding pressure is unevenly distributed,the tread exhibits a “double peak” distribution phenomenon,and the tire grounding performance is poor;The results of the finite element analysis are consistent with the actual problems of the non-pneumatic tires.For the stress concentration of the support structure and the uneven distribution of the grounding pressure of the tread,the support structure is optimized by changing the radius of the hole arc between the support structures and the number of support structures,the grounding condition is optimized by embedding hard elastomer layers of different widths and thicknesses.The finite element model of the non-pneumatic tire after optimization is established.The influence of the radius of the hole arc,the number of support structures,the width of the hard elastomer layer and the thickness on the performance of the non-pneumatic tire is obtained through simulation analysis.According to the relevant variation law obtained from the optimization analysis,the orthogonal simulation test of the arc radius,the number of support structures,the width and thickness of the hard elastomer layer is designed.By designing the orthogonal test,the optimal factor level of the non-pneumatic tire is obtained.The support structure performance and grounding performance of the optimal combination tire are greatly improved.In the optimal combination of non-pneumatic tires,the radius of the hole arc is(R1=17mm,R2=20mm),the number of support structures is 40,the width of the hard elastomer layer is 44 mm,and the thickness of the hard elastomer layer is 6mm,and finally the comprehensive performance of non-pneumatic tire is best.