温度对考虑黏弹性的钢-橡胶对滚结构动态力学特性的影响

    Effect of Temperature on the Dynamic Mechanical Properties of Steel-Rubber Rolling Structure Considering Viscoelasticity

    • 摘要: 为研究温度对考虑黏弹性的钢-橡胶对滚结构的动态力学特性的影响,通过钢-橡胶对滚结构实验平台进行钢-橡胶对滚结构动态力学特性实验,测得在连续转动过程中橡胶辊的温度变化以及压深变形量、接触宽度等,分析温度对橡胶辊压深变形量及接触宽度的影响.采用与实验平台橡胶辊相同材料的圆盘形试样进行动态热分析实验,得到不同温度下的橡胶应力松弛曲线以及不同频率下的损耗因子;基于此实验数据,对橡胶材料进行本构模型参数辨识,得到不同温度下超弹、黏弹参数;最后对钢-橡胶对滚结构进行不同温度下的瞬态动力学仿真,讨论橡胶辊的黏弹性强弱与温度的关系,分析不同温度下橡胶辊的压深变形量、接触宽度、von Mises应力应变、接触压力以及接触刚度等特性.结果表明:橡胶辊的黏弹性程度随温度的升高而减弱;温度对橡胶辊动态力学特性的显著影响表现在von Mises应力、接触压力及接触刚度随温度的升高而减小,von Mises应变、压深变形量及接触宽度随温度的升高而增大.

       

      Abstract: For the purpose of studying the effect of temperature on the dynamic mechanical properties of steel-rubber rolling structure with viscoelasticity considered, the dynamic mechanical properties of steel-rubber rolling structure were tested through an experimental platform. The temperature change of the rubber roller during the continuous rotation, as well as the depth of deformation and contact width were measured by experiment, and the effect of temperature on the depth of deformation and contact width of the rubber roller was analyzed. A disk-shaped sample of the same material as the rubber roller of the experimental platform was used for dynamic thermal analysis experiments to obtain rubber stress relaxation curves at different temperatures and loss factors at different frequencies. Based on the experimental data, the constitutive model parameters of the rubber material were identified, and the hyperelastic and viscoelastic parameters at different temperatures were obtained, respectively. Finally, the transient dynamics simulation of the steel-rubber rolling structure at different temperatures was carried out. The relationship between the viscoelastic strength of the rubber roller and the temperature was discussed. The characteristics of the depth of deformation, contact width, von Mises stress and strain, contact pressure and contact stiffness of the rubber roller at different temperatures were analyzed. Results show that the degree of viscoelasticity of the rubber roller decreases with increasing temperature, and the significant influence of temperature on the dynamic mechanical properties of rubber rollers is that von Mises stress, contact pressure and contact stiffness decrease with increasing temperature, and von Mises strain, depth of deformation and contact width increase with increasing temperature.

       

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