橡胶热氧老化对橡胶隔震垫动刚度及损耗因子的影响机理

IF 3.4 4区 化学 Q2 POLYMER SCIENCE International Journal of Polymer Science Pub Date : 2022-11-05 DOI:10.1155/2022/8673245
Junjie Chen, Xian Li, Changyao Chen, Chao Yang, Xiang-yu Gao
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引用次数: 0

摘要

热氧老化对橡胶隔震垫(RIP)动态特性的影响机理在研究中往往被忽略。然而,RIP的环境温度一般可达70℃,在某些极端条件下甚至可达108℃,这会导致RIP的热氧老化加速,机械性能下降。同时,热氧老化会导致外部空调过度振动,甚至损坏。因此,研究橡胶热氧老化对RIP动态性能的影响机理对RIP力学特性匹配至关重要。考虑热氧老化对RIP动态特性的影响,采用Peck模型、超弹性模型、分数阶导数模型和光滑库仑摩擦模型(SCFM),建立了新的热氧老化- RIP动态特性模型。基于MTS831弹性体试验系统,建立了RIP的静态和动态特性试验平台,建立了模型参数辨识方法,并通过实验数据对热氧老化-动态特性模型进行了验证。结果表明:随着热氧时效硬度的提高,RIP的静态刚度和动态刚度的最大增长率分别为20.7%和4.5%,损耗因子的最大降幅为10.6%;利用热氧老化动态特性模型有效表征了RIP的幅值依赖性、频率依赖性和热氧老化依赖性。同时,为热氧老化条件下RIP服役后动态特性的演变规律提供了理论依据。
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Influence Mechanism of Rubber Thermal Oxygen Aging on Dynamic Stiffness and Loss Factor of Rubber Isolation Pad
The influence mechanism of thermal oxygen aging on the dynamic characteristic of the rubber isolation pad (RIP) is usually ignored in studies. However, the ambient temperature of the RIP could reach up to 70°C in general, and even 108°C under some extreme conditions, which will lead to accelerated thermal oxygen aging and a decline in the mechanical performance for the RIP. In the meantime, the thermal oxygen aging will result in excessive vibration and even a damaged external air conditioner. Therefore, the research on the influence mechanism of rubber thermal oxygen aging on the dynamic performances of the RIP is crucial to the mechanical characteristic matching of the RIP. Considering the effect of the thermal oxygen aging on the dynamic characteristic, a novel model of thermal oxygen aging-dynamic characteristic of the RIP is established by adopting the Peck model, the hyperelastic model, the fractional derivative model, and the smooth Coulomb friction model (SCFM) in this paper. A test rig of the static and dynamic characteristics of the RIP is built, and an identification method of model parameters is developed based on the MTS831 elastomer test system as well which of the thermal oxygen aging-dynamic characteristic model is verified by the experimental data. The result is shown that the maximum growth rate of the static stiffness and the dynamic stiffness is 20.7% and 4.5%, respectively, and the maximum decrease rate of the loss factor is 10.6% as the thermal oxygen aging hardness of the RIP increases by 5HA. The amplitude-dependent, frequency-dependent, and thermal oxygen aging-dependent performances of the RIP are effectively characterized by the thermal oxygen aging-dynamic characteristic model. Moreover, a theoretical foundation is provided for the evolution law of the dynamic characteristic of the RIP after the service with the thermal oxygen aging condition in this research.
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来源期刊
CiteScore
6.10
自引率
0.00%
发文量
55
审稿时长
>12 weeks
期刊介绍: The International Journal of Polymer Science is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles on the chemistry and physics of macromolecules.
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