Damage Simulation Analysis And Life Prediction Of Rubber Products

With the development of industry,a variety of rubber products have been widely used in most fields,the damage and durability of rubber materials have become the focus of attention.As a complex rubber product,the performance of tire is directly related to the safety of the vehicle and the driver,the use of tire performance research is very important.Tire damage is caused by a variety of complex factors.Tire tread rubber damage is mainly manifested by the formation of small cracks caused by abrasion and rubber Mullins effect.As the damage accumulates,the cracks expand and eventually lead to fatigue damage.In this paper,different types of tire damage were studied,including radial tire wear,Mullins damage and external force damage of solid tire,fatigue life of solid tire,and the influences of various factors on tire damage and fatigue degree were discussed.Firstly,the user subroutine UMESHMOTION in ABAQUS was used to simulate and analyze the wear process of 11.00R20 pneumatic tire.The Archard wear model calculation program was written with MATLAB to verify the accuracy of the subroutine calculation in complex pneumatic tire.The results show that the mileage is1.08×10~5km according to tire wear label,which is close to the actual road test results of tire wear.The tread height of pneumatic tire decreases after wear,and the contact pressure in ground area decreases and the distribution tends to be average.With the increase of driving mileage,the wear depth per unit time gradually decreases and tends to be stable.Through the analysis of the influence of tire working conditions on tire wear depth,the tread wear depth increases with the increase of rolling speed and vertical load,and the tire pressure is too high or too low will aggravate the uneven tread wear,resulting in local excessive wear,affecting the tire mileage.Then,the finite element model of solid tire was established,and the tread damage of solid tire was analyzed from the aspects of internal damage caused by Mullins effect and damage caused by external force,and various factors affecting tread damage were explored.The structure of solid tire was optimized by combining various parameters.The results show that considering Mullins parameters can better describe the complex mechanical behavior of rubber materials.Within a certain range,the larger r,m and?parameters are,the smaller the damage caused by the material is,the larger the load is and the greater the damage degree is.Considering several main tire performance parameters such as damage energy density,solid tire with convex arc tread and radian radius of 1100 mm and tread thickness of 47 mm performed best.The damage caused by external force on the tread of heavy solid tire when rolling through the gravel road was investigated.With the increase of load,the damage energy and damage area caused by tread rolling over gravel increased.Finally,fe-safe/Rubber module was used to calculate the fatigue life of the solid tire,and a solid tire model with a crack on the tire side was established to explore the influences of different crack sizes on the fatigue life.The results show that the first fatigue failure region predicted by software is consistent with the maximum damage energy density region obtained from mechanical field calculation,indicating that the damage energy density can reflect the fatigue durability of rubber material.With the increase of the radial height of the crack,the fatigue life of the tire side crack decreases,and the first failure location is always at the crack tip.