新型三明治夹芯金属橡胶毡垫本构模型研究
STUDY ON CONSTITUTIVE MODEL OF NEW SANDWICH METAL RUBBER FELT PADS
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摘要: 对新型三明治夹芯金属橡胶毡垫的本构模型开展了预测研究. 在分别考虑由上、下金属丝表层与不同丝材和丝径相互混压而成的多层夹芯结构形式的基础上, 基于微弹簧单元理论和串/并联刚度分析法, 创建了新型三明治夹芯金属橡胶毡垫的本构模型. 定义了未接触、滑移接触和挤压接触3种接触状态, 在推导获得不同接触状态下该毡垫的加载和卸载刚度后, 实现了应力-应变曲线的预测. 最后, 对由铜丝和不锈钢丝构成的多款三明治夹芯金属橡胶毡垫样件开展了准静态压缩测试. 实验结果表明, 所建立的本构模型的最大刚度预测误差为9.1%, 最大损耗因子预测误差为10.7%, 具有较好的预测能力, 且新型金属橡胶毡垫相比于传统金属橡胶毡垫具有更好的减振能力. 相关研究成果可为新型金属橡胶毡垫构成的结构系统的关键力学参数计算与分析, 提供重要的模型工具.Abstract: The constitutive model of new sandwich metal rubber felt pads is studied. With consideration of the upper and lower metal wire surfaces and the multi-layer sandwich core made by different metal wires and diameters, a new constitutive model of such sandwich metal rubber felt pads is created based on the micro spring element theory and the series/parallel stiffness analysis method. Three contact states are defined, including non-contact, sliding contact, and squeezing contact states. Subsequently, the stress-strain curve is predicted when the loading and unloading stiffness values of such felt pads with different contact states are obtained. Finally, quasi-static compression tests are conducted on samples of sandwich metal rubber felt pads composed of copper and stainless steel wires. The measured results show that the maximum prediction errors of the stiffness and loss factor of the current constitutive model are 9.1% and 10.7%, which proves the present model has good predictive ability. Also, the new metal rubber felt pad possesses better anti-vibration capability compared to the traditional one. The research results in this study can provide an important modeling tool for the calculation and analysis of key mechanical parameters of structure systems composed of new metal rubber felt pads.
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