| The main contents of this paper are based on the orthogonal experimental theory,and the nine calculation conditions are determined for the four factors:load,velocity,running width and cord angle in tire use.By comparing the finite element calculation results of tire lag temperature And the factors that have the greatest impact are analyzed.By analyzing the values of the grounding area and the ground section under the nine orthogonal conditions of the tire rolling pro-cess,the factors influencing the maximum value are analyzed,and the three factors of different load,velocity and section width are analyzed.Mechanical properties;verify the feasibility of strain energy density,tear energy as fatigue life parameters.(1)The steady-state rolling finite element calculation of motorcycle tires was carried out to obtain the normal stress in the grounded area under nine or-thogonal conditions,the Mises stress in the grounding area,the strain energy density at the end of the belt and the Mises stress at the end of the belt The results show that the load has the greatest influence on the normal stress,the grounding area and the Mises stress at the end of the belt.The velocity has the greatest influence on the strain energy density of the belt.For the load,velocity and the width of the section The geometrical stress,the Mises stress of the ground section and the strain energy density at the end of the belt can be seen.With the increase of the load,the normal stress of the grounding and the Mise sstress increase,and the strain energy density at the end of the belt decreases.The increase of velocity,ground stress,Mises stress and strain energy density increase;with the increase of the width of the section,the values decrease first and then increase.The temperature of the tire is calculated by the finite element method.At the same time,according to the stress and strain process,the life of the unit is calculated by the critical plane method,and the life span of the unit is calculated.As a hazardous unit,the shortest life is the calculated tire life.(2)The steady-state rolling finite element calculation of motorcycle tires is carried out,and the stress,strain and strain energy density distribution and variation process of tire under steady state rolling are obtained under nine or-thogonal experimental conditions.Then,according to the viscoelastic material The process of the hysteresis and the tire during the operation of the pulse,the stress,strain changes Fourier 8 order transformation,and through the formula to calculate the heat generated by the heat rate as the rubber material within the heat source parameters,through the limited The elemental analysis gives the tire lag temperature distribution.The average temperature rise of the tire in the shoulder and the bead is the maximum,and the temperature range is about 15?45 ?.In the four factors of load,speed,loss factor and cord angle,the average delay temperature and the maximum lag temperature The most influential fac-tors are the speed of the tire.(3)According to the stress-strain change process,the life of the unit of the tire section is calculated by the critical plane method.The fatigue life distri-bution cloud diagram is obtained,and the tire tear energy and the strain energy density distribution cloud diagram are compared to verify the feasibility of the fatigue life parameter Considering the relationship between rubber strain and temperature rise,the effect of the lagging temperature rise of tire rolling process on its fatigue life is obtained. |
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