Zheng Xiaoyuan, Ren Zhiying, Shen Liangliang, Zhang Bin, Bai Hongbai
School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China.
Engineering Research Center for Metal Rubber, Fuzhou University, Fuzhou 350116, China.
Materials (Basel). 2021 Jan 2;14(1):187. doi: 10.3390/ma14010187.
In this study, a laminated composite damping structure (LCDS) with metal rubber (MR) as matrix and silicone rubber (SR) as reinforcement has been designed. The embedded interlocking structure formed by the multi-material interface of the LCDS can effectively incorporate the high damping characteristics of traditional polymer damping materials and significantly enhance the adjustable stiffness of the damping structure. Based on the periodic cyclic vibration excitation, dynamic tests on different laminated structures were designed, and the damping performance and fatigue characteristics under periodic vibration excitation of the LCDS, based on MR and SR, were explored in depth. The experimental results exhibited that, compared to single-compound damping structures, the LCDS with SR as reinforcement and MR as matrix has excellent stiffness and damping characteristics. The incorporation of the silicon-based reinforcement can significantly improve the performance of the entire structure under cyclic fatigue vibration. In particular, the effects of material preparation and operating parameters on the composite structure are discussed. The effects of MR matrix density, operating frequency, amplitude, and preload on the stiffness and damping properties of the MR- and SR-based LCDS were investigated by the single factor controlled variable method. The results demonstrated that the vibration frequency has little effect on the LCDS damping performance. By increasing the density of the MR matrix or increasing the structural preload, the energy dissipation characteristics and damping properties of the LCDS can be effectively improved. With the increase in vibration excitation amplitude, the energy consumption of the LCDS increases, and the average dynamic stiffness changes at different rates, resulting in the loss factor decreasing first and then increasing. In this study, a damping structure suitable for narrow areas has been designed, which overcomes the temperature intolerance and low stiffness phenomena of traditional polymer rubber materials, and provides effective guidance for the design of damping materials with controllable high damping and stiffness.
在本研究中，设计了一种以金属橡胶（MR）为基体、硅橡胶（SR）为增强体的层压复合阻尼结构（LCDS）。由LCDS的多材料界面形成的嵌入式互锁结构能够有效融合传统聚合物阻尼材料的高阻尼特性，并显著提高阻尼结构的可调刚度。基于周期性循环振动激励，设计了对不同层压结构的动态测试，并深入探究了基于MR和SR的LCDS在周期性振动激励下的阻尼性能和疲劳特性。实验结果表明，与单组分阻尼结构相比，以SR为增强体、MR为基体的LCDS具有优异的刚度和阻尼特性。硅基增强体的加入可显著提高整个结构在循环疲劳振动下的性能。特别地，讨论了材料制备和运行参数对复合结构的影响。采用单因素控制变量法研究了MR基体密度、运行频率、振幅和预载对基于MR和SR的LCDS刚度和阻尼性能的影响。结果表明，振动频率对LCDS的阻尼性能影响较小。通过增加MR基体的密度或增加结构预载，可有效改善LCDS的能量耗散特性和阻尼性能。随着振动激励振幅的增加，LCDS的能量消耗增加，平均动态刚度以不同速率变化，导致损耗因子先减小后增大。在本研究中，设计了一种适用于狭窄区域的阻尼结构，克服了传统聚合物橡胶材料不耐温和刚度低的现象，为具有可控高阻尼和刚度的阻尼材料设计提供了有效指导。
