Stress relaxation properties and the prediction models for PTFE membranes

XU Shan-shan; ZHANG Ying-ying; ZHANG Qi-lin

doi:10.3879/j.issn.1000-0887.2016.03.005

Volume 37 Issue 3

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XU Shan-shan, ZHANG Ying-ying, ZHANG Qi-lin. Stress relaxation properties and the prediction models for PTFE membranes[J]. Applied Mathematics and Mechanics, 2016, 37(3): 266-276. doi: 10.3879/j.issn.1000-0887.2016.03.005

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Stress relaxation properties and the prediction models for PTFE membranes

doi: 10.3879/j.issn.1000-0887.2016.03.005

¹Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P.R.China;²College of Civil Engineering, Tongji University, Shanghai 200092, P.R.China

Funds: The National Natural Science Foundation of China(51308532;90815003);China Postdoctoral Science Foundation(2013M541756)

Received Date: 2015-11-02
Rev Recd Date: 2016-01-13
Publish Date: 2016-03-15

Abstract

Abstract

With the PTFE membranes as the research object, the uniaxial stress relaxation tests were carried out respectively under 5 temperatures (23, 40, 50, 60, 70 ℃) and at 4 initial tensile rates (2, 5, 10, 20 N/s), and the effects of these 2 kinds of factors on the stress relaxation properties of the membranes were investigated. The variations of the relaxation moduli were got and several existent viscoelastic constitutive models were used to fit the experimental data. The results show that, the PTFE membranes exhibit obvious stress relaxation behaviors. Both the temperature and the initial tensile rate have significant effects on the stress relaxation characteristics. The membrane stress relaxation rate decreases while the final steady stress increases with the temperature; on the other hand, the final steady stress decreases with the initial tensile rate while the stress relaxation rate keeps almost unaffected. Most of the existent viscoelastic models, esp. the fractional exponent one, make good predictions for the stress relaxation behaviors of the PTFE membranes, while some models work ill due to their poor compositions.
- PTFE membrane,
- stress relaxation,
- temperature,
- initial tensile rate,
- viscoelastic constitutive relation

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References(20)

References

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