Compressive stress relaxation modeling of butadiene rubber under thermo‐oxidative aging

Wang, Zheng; Zhao, Xiuying; Li, Qiang‐Guo; Chan, Tung W.; Zhang, Liqun; Wu, Sizhu

doi:10.1002/app.44630

Cited by 30 publications

(19 citation statements)

References 19 publications

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“…Stress relaxation is rather extensively studied in industrially important elastomers at temperatures above T g in connection with their aging and chemical degradation, e.g. in [4][5][6][7][8][9][10]. However, there are few studies dedicated to SR at low temperatures, specifically near the glassy region, even though some industrial equipment with elastomer components can be permanently or periodically exposed to such temperatures [11,12].…”

Section: Introductionmentioning

confidence: 99%

Compression stress relaxation in carbon black reinforced HNBR at low temperatures

2017

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Findings of a study of stress relaxation behaviour of hydrogenated nitrile butadiene rubber (HNBR) at nominal compressive strains up to 0.4 and temperatures above and below the glass transition temperature T g are reported. Two formulations of a model HNBR with 36 % acrylonitrile content and carbon black (CB) loading of 0 and 50 phr were investigated. The relaxation function of HNBR is found to be independent of strain at temperatures right above the T g or at times longer than 10-3 sec for the deformations employed. CB imparts higher long-term stiffness and also larger relaxation strength at times longer than 10-4 sec to the HNBR, but it does not affect the relaxation behaviour of the rubber in the time span from 10-3 to 10 4 sec. In addition, the relationship between the strain energy function of HNBR and temperature is demonstrated to have a complex concave-downward shape which is affected by two competing contributions of entropy elasticity and the stress relaxation.

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Section: Introductionmentioning

confidence: 99%

Compression stress relaxation in carbon black reinforced HNBR at low temperatures

2017

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“…For example, the works demonstrated in Refs. have provided mathematical models to characterize the static continuous stress relaxation of rubber during aging, and the analytical results agree well with the experimental data.…”

Section: Introductionmentioning

confidence: 55%

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

Zhi

Wang

Zhang

et al. 2019

J of Applied Polymer Sci

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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. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47452

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“…In the first level, an empirical model 27 is adopted to describe the degradation behavior of polymeric materials. Denote D ij as the observed degradation data of individual i at time t ij , where i = 1 , 2 , … , N and j = 1 , 2 , … , n i .…”

Section: Model Formationmentioning

confidence: 99%

Bayesian inference for a novel hierarchical accelerated degradation model considering the mechanism variation

Wang

Zhao

2020

Proceedings of the Institution of Mechanical Engineers, Part O:

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For highly reliable products, accelerated thermal degradation tests are efficient to provide feedback on reliability information. In accelerated thermal degradation tests, the degradation data collected at the elevated temperatures are used to extrapolate the performance of products at the normal temperature. An important tool in such extrapolation is the Arrhenius model, in which the activation energy is generally assumed to be constant. However, in some practical accelerated thermal degradation tests of polymeric materials, a variation of the underlying degradation mechanism is induced when the temperature rises to a certain high level, resulting in a change in the activation energy. Motivated by this phenomenon, we propose a two-stage Arrhenius model. The two stages correspond to the lower and higher temperature ranges with different activation energies. Then, this new model is incorporated to the degradation model, yielding a novel hierarchical model for the accelerated thermal degradation test data from polymeric materials involving a mechanism variation. Furthermore, the Bayesian method is adopted for parameter inference, and the lifetime distribution is obtained subsequently. A practical example of polysiloxane rubbers demonstrates the effectiveness of the proposed model.

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Compressive stress relaxation modeling of butadiene rubber under thermo‐oxidative aging

Cited by 30 publications

References 19 publications

Compression stress relaxation in carbon black reinforced HNBR at low temperatures

Compression stress relaxation in carbon black reinforced HNBR at low temperatures

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

Bayesian inference for a novel hierarchical accelerated degradation model considering the mechanism variation

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