Coupled analysis on heterogeneous oxidative aging and viscoelastic performance of rubber based on multi‐scale simulation

Zhi, Jieying; Wang, Qinglin; Zhang, Mengjie; Li, Manjia; Jia, Yuxi

doi:10.1002/app.47452

Cited by 9 publications

(8 citation statements)

References 40 publications

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“…The oxidation of the polymers normally leads to an increase in the crosslinking density due to the introduction of the higherdensity oxidation groups with time, which finally results in an increase in the static stiffness. Combining Equations ( 12), ( 19), (25), and (30), it can be found that the dynamic stiffness will also increase with the increase in the static stiffness.…”

Section: Model Validationmentioning

confidence: 99%

“…However, the variation of force-displacement relationship and the influence of rubber thermal oxygen aging are not considered as well. Zhi et al [25] further considered the effect of the thermal oxygen aging, and then, a suitable constitutive model of aging-viscoelastic coupling was established. However, the influence of the thermal oxygen aging on the dynamic viscoelasticity of natural rubber was only studied by the finiteelement method, rather than the accurately theoretical modeling method, which is difficult to be directly applied to stiffness optimization of the vibration isolation system.…”

Section: Introductionmentioning

confidence: 99%

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Influence Mechanism of Rubber Thermal Oxygen Aging on Dynamic Stiffness and Loss Factor of Rubber Isolation Pad

Chen

et al. 2022

International Journal of Polymer Science

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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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Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence Mechanism of Rubber Thermal Oxygen Aging on Dynamic Stiffness and Loss Factor of Rubber Isolation Pad

Chen

et al. 2022

International Journal of Polymer Science

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“…where, t s is the time of compression or stretching, and x ( t s ) is the displacement in the process of compression or stretching, and μ ( t ) is also a function of time, t >> t s , so the thermal oxygen aging factor μ can be viewed as a constant. In order to simplify the parameters and accurately characterize the variation trend of the viscoelastic force of the RIP under thermal oxygen aging, 27 the linear material parameter γ is also used to improve the prediction accuracy of the viscoelastic force. The viscoelastic force-displacement equation of FDTPM can be expressed as follows,…”

Section: Thermal Oxygen Aging-dynamic Characteristic Model Of Ripmentioning

confidence: 99%

Research on dynamic characteristic of compressor RIP under thermal oxygen aging and variable preload conditions

Chen

Gan

et al. 2023

Advances in Mechanical Engineering

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The dynamic characteristics of rubber isolation pad (abbreviated as RIP) after service under the high temperature thermal oxygen aging and the variable preloads have preload dependence and thermal oxygen aging dependence, which is a crucial problem for matching the vibration isolation system of air conditioner compressor to reveal the dynamic characteristic mechanism of the RIP with different preloads and thermal oxygen aging conditions. The Peck model is first introduced to characterize the thermal oxygen aging factor, the fractional derivative Kelvin-Voigt thermal oxygen aging-perturbation model (FDKVTPM) and the Coulomb frictional thermal oxygen aging-perturbation model (CFTPM) are established to describe the frequency dependence and the amplitude dependence, respectively. The thermal oxygen aging-dynamic characteristic model of the RIP is built by considering the influence of variable preloads, the model parameters under different preloads are further identified, the validity of the model was examined by the experimental data. The concepts of the stiffness transition point (STP) and the stiffness transition frequency (STF) are innovatively proposed to better describe softening effect of the RIP under variable preload and variable amplitude working conditions. The results show that the static stiffness of RIP increases by 20.7%, the dynamic stiffness increases by 9.3%, and the loss factor decreases by 35% after thermal oxygen aging under different preload conditions, which can lay a theoretical foundation for in-depth study of the stiffness matching and optimization of air conditioner compressor with the RIP.

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“…They concluded that the diffusion coefficients of the gases decreased in the following order: SBR (poly (styrene-stat-butadiene)rubber) > PS (atactic polystyrene) > SMA (poly(styrene-alt-maleic anhydride) copolymer), while the solubility coefficients showed the opposite order. Zhi et al [ 35 ] studied the oxygen diffusion behaviors in natural rubber by using molecular simulation. It can be found that the heterogeneous degradation caused by diffusion-limited oxidation can result in a complex stress distribution in natural rubber.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Oxidative Aging Effect on Diffusion Behaviors of Oxygen and Cyclohexane in NBR

Yang

2022

Polymers

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The influences of thermal-oxidative aging on the diffusion behaviors of oxygen and cyclohexane in nitrile-butadiene rubber (NBR) at the micro-scale were investigated by molecular dynamics (MD) simulation. The two types of aged rubber models were established on the basis of rubber oxidative chains modified by the introduction of hydroxyl groups and carbonyl groups in rubber chains. The diffusion behaviors of oxygen and cyclohexane in NBR under different conditions were characterized by the fractional free volume (FFV), mean square displacement (MSD), diffusion coefficients, and diffusion trajectory. It turns out that the elevated temperature contributed to the increase in the free volume and diffusion range of oxygen and cyclohexane, while the compressive stress showed the reverse influence. Additionally, the introduction of oxidative polar functional groups (hydroxyl groups and carbonyl groups) in rubber chains lowered the flexibility of the rubber chains and promoted the formation of strong polar interaction, which further inhibits the diffusion of oxygen and cyclohexane.

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Coupled analysis on heterogeneous oxidative aging and viscoelastic performance of rubber based on multi‐scale simulation

Cited by 9 publications

References 40 publications

Influence Mechanism of Rubber Thermal Oxygen Aging on Dynamic Stiffness and Loss Factor of Rubber Isolation Pad

Influence Mechanism of Rubber Thermal Oxygen Aging on Dynamic Stiffness and Loss Factor of Rubber Isolation Pad

Research on dynamic characteristic of compressor RIP under thermal oxygen aging and variable preload conditions

Molecular Dynamics Simulation of Oxidative Aging Effect on Diffusion Behaviors of Oxygen and Cyclohexane in NBR

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