工程车辆翻新轮胎承载变形特性

为了进一步明确工程车辆翻新轮胎的力学性能，提高其使用寿命，通过构建工程车辆翻新轮胎计算机几何模型、有限元分析模型、承载变形特性试验系统，对工程车辆翻新轮胎承载变形特性进行有限元分析及试验研究，并与同型号新轮胎进行对比分析，获得静态接地工况下工程车辆翻新轮胎的载荷-变形、载荷-刚度、载荷-压缩率等特性规律，构建26.5R25工程车辆翻新轮胎径向承载变形数学模型。研究结果表明：工程车辆翻新轮胎的径向变形、侧向变形变化规律与新轮胎接近，径向与侧向变形均比同型号新轮胎稍小；当胎压一定时，随着载荷的增加，工程车辆翻新轮胎径向变形呈线性增大，当胎压较低时侧向变形呈线性增大，当胎压较高时侧向变形呈非线性增大；工程车辆翻新轮胎的径向刚度及压缩率受径向载荷和胎压的影响较大，载荷一定时，径向刚度随胎压的增大而增大；胎压一定时，工程车辆翻新轮胎的压缩率随径向载荷的增大而增大，且稍小于同品牌、同型号新轮胎的压缩率；旧胎体的不同老化程度对工程车辆轮胎翻新后的承载-变形特性会产生较大的影响；在低载工况下，工程车辆翻新轮胎和新轮胎径向刚度差异不大，在接近标准载荷及高载工况下，工程车辆翻新轮胎径向刚度较新轮胎大，且随着载荷的增大，工程车辆翻新轮胎和新轮胎径向变形差异不断加大。

Loading Deformation Properties of Engineering Vehicle's Retreaded Tire

To further clarify the mechanical properties of the retreaded tires of engineering vehicles for the purpose of improving their service life, this study carried out finite element analysis and experimental investigations into the load deformation properties of an engineering vehicle's retreaded refurbished tire, and compared the analysis results to the load deformation properties of an identical new tire. Thus, various rules with regard to an engineering vehicle's retreaded tire were obtained, such as the load deformation, load stiffness, and load compression ratio properties under a working static grounding condition. Moreover, a load deformation mathematical model of the 26.5R25 engineering vehicle's retreaded tire was developed. The results revealed that the radial deformation and side deformation of the engineering vehicle's retreaded tire were similar to those of a new tire, while the radial and side deformation values were less than those of a new tire. When the tire pressure was certain, the linear change rule of the radial deformation increased as the load increased. When the tire pressure was low, the side deformation obeyed a linear change rule and increased. However, when the tire pressure was high, the side deformation changed non-linearly and increased. The radial stiffness and compression ratio of the engineering vehicle's retreaded tire were greatly affected by the radial load and tire pressure. When the load was certain, the radial stiffness increased as the tire pressure increased. When the tire pressure was certain, the compression ratio of the engineering vehicle's retreaded tire increased with the increase of the radial load, and was slightly less than that of the new tire of the same brand and same model. The different aging degree of the old carcass ply had a great influence on the load deformation properties after refurbishment. Under low load conditions, the differences between the radial stiffness of the retreaded tire and the radial stiffness of the new tire were not great. Under a near standard load and high load conditions, the radial stiffness of the refurbished tire was larger than that of the new tire. Moreover, the radial deformation differences between the retreaded tire and new tire increased as the load increased.