金属橡胶热物理性能理论与试验研究

针对金属橡胶材料在高温环境下的热稳定性能和热传导性能, 基于金属橡胶的内部基本组分以及特殊的编织制作工艺, 构建了两种典型排列微元体结构, 并以此描述微元体在三种接触状态下的热膨胀特性, 提出了金属橡胶热膨胀Schapery分析模型, 从理论上解释了金属橡胶热膨胀的产生机理.根据金属橡胶基本组成单元的传热模式, 研究了金属橡胶的传热过程.利用热电比拟法和有限元法, 分析微元体的导热性能, 结合微元体的分布形式, 提出了金属橡胶的导热分析模型.试验测试了不同相对密度金属橡胶的热膨胀和热传导性能, 验证了金属橡胶热膨胀和导热特性分析理论模型的适用性.所得到的金属橡胶的热膨胀和热传导性能理论模型和试验结果, 为金属橡胶材料在高温环境下的热物理特性分析提供了理论基础和计算分析依据.关键词：金属橡胶热膨胀热传导金属丝螺旋卷

Theoretical and experimental investigation on thermophysical properties of metal rubber

Metal rubber (MR) is a new-type damping material with special raw material and manufacturing process. The helix wire is considered as the geometric unit of MR. The thermal expansion model of the MR is established based on the thermal expansion analyses of micro-springs in different contact states with the Schapery model. Thermal experiments are conducted to analyze the effects of relative density and temperature on the thermal expansion property of metal rubber. The heat transfer process of the MR and the heat transfer model of helix wires are obtained based on MR microstructure. Under certain conditions, the heat transfer can be simplified into the single thermal conductions. Based on the Fourier law, thermal conduction of MR microstructure is analyzed using the thermoelectric analogy method. Combined with the equivalent coefficient law of the thermal conduction, the thermal conduction model of MR is established. The formula of the thermal conduction coefficient is derived. The accuracy of the theoretical model is verified by the experimental results. The theoretical and experimental results of the thermal expansion and heat transfer provide strong theoretical and calculative analytical foundation for the application of the MR in the heat insulation material field at high temperature.