Design And Simulation Analysis Of Supercritical Foam TPU Safety Tire

Nowadays,the tires installed in automobiles are mainly pneumatic tires,but once the tires of general pneumatic tires burst,they will deflate instantly,causing the vehicle to lose control.Therefore,the production of a safe tire to ensure that a flat tire can still support the load,and continue to travel a certain distance has become the focus of current research.It was under this trend that this paper applies light and elastic foam polyurethane(E-TPU)to tires,and designed a safety tire with E-TPU as material.When the tire suddenly deflates,the E-TPU is used as the support load of the inner support body to prevent accidents caused by the sudden sinking of the tire,and to achieve the function of air deficiency protection.The main research work of this paper is as follows:First,the material property parameters in material simulation were determined.After sample preparation,uniaxial tensile test,stress relaxation test and cyclic tensile test were carried out for each part of the material.After fitting,the matching degree of constitutive equations such as Mooney-Rivilin model,Yeoh model and Neo-Hookean model of rubber material was discussed.Finally,the Yeoh model was selected as the material model of rubber material in the simulation,and the measured curve was used as the E-TPU material model curve.Secondly,the optimum forming process and properties of E-TPU materials were studied.The influence of forming temperature,forming time,forming pressure and material density on E-TPU material was discussed by orthogonal test.The results showed that 140 ?,8 MPa and 15 min were the best molding temperatures for the polyurethane foam particles.Thirdly,the resilience test simulation of the inner support material E-TPU and rubber material was carried out to verify the accuracy of the material properties after comparison with the actual experiment.Meanwhile,the change of energy in the resilience test process was explored.The results show that the simulation results match well with the experimental results,which verifies the accuracy of the material properties.Most of the lost kinetic energy is absorbed by the material,and a small part is converted into heat and lost to the air.Fourth,the design of the two types of support within the body safety tires,based on the finite element software ABAQUS,inner supporting structure design,combined with the simulation analysis result,to optimize the inner supporting body size and eventually reach a standard condition does not affect the tire handling and comfort,When the tire is air leakage,it can support the load and continue to travel a certain distance.Fifth,choose a project design with lower production difficulty and better safety performance to produce the sample tire and test performance.The test results are basically consistent with the static simulation results.At present,it can effectively support the tire for a safe journey of 15 km,and the internal structure of the inner support body is still intact except for the surface damage.