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

机译:基于多尺度模拟的橡胶异质氧化老化和粘弹性性能的耦合分析

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摘要

An oxidative aging-viscoelastic constitutive model was established to study the coupled heterogeneous oxidation and viscoelastic performance of rubber during aging process. The basic elasticity and viscoelasticity of rubber materials were comparatively considered as the function of ongoing aging. The dynamic compression process of natural rubber at different aging times was analyzed by the finite element method. And then the effects of oxygen uptake, diffusion, and oxidative reactions on the dynamic viscoelasticity of rubber were analyzed. The permeability of the oxygen in natural rubber was determined by means of molecular dynamics simulation. The results reveal that the heterogeneous degradation caused by diffusion-limited oxidation can lead to a complex stress distribution in the natural rubber specimen under dynamic loading condition; the relaxation time and the energy dissipation of the rubber specimen also increased after aging. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47452
机译:建立了氧化衰老粘弹性本构模型,研究了老化过程中橡胶偶联的非均相氧化和粘弹性性能。橡胶材料的基本弹性和粘弹性与持续老化的功能相比相对考虑。通过有限元方法分析了不同老化时间在不同老化时的动态压缩过程。然后分析了氧吸收,扩散和氧化反应对橡胶动态粘弹性的影响。通过分子动力学模拟测定天然橡胶中氧在天然橡胶中的渗透率。结果表明,由扩散限制氧化引起的异质降解可导致动态负载条件下天然橡胶样品中的复合应力分布;橡胶标本的弛豫时间和耗能量也在老化后增加。 (c)2019 Wiley期刊,Inc.J.Phill。聚合物。 SCI。 2019,136,47452

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