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CLC number: TH140.7; TH145.4+2

On-line Access: 2010-10-05

Received: 2010-04-17

Revision Accepted: 2010-08-16

Crosschecked: 2010-08-20

Cited: 1

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Citations:  Bibtex RefMan EndNote GB/T7714

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Journal of Zhejiang University SCIENCE A 2010 Vol.11 No.10 P.811-816

http://doi.org/10.1631/jzus.A1000182


Rate-dependent constitutive model of poly(ethylene terephthalate) for dynamic analysis


Author(s):  Qiang Li, Shu-lian Liu, Shui-ying Zheng

Affiliation(s):  Institute of Chemical Machinery, Zhejiang University, Hangzhou 310027, China, Department of Electro-Mechanical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China

Corresponding email(s):   liqiangsydx@163.com, zhengshuiying@zju.edu.cn

Key Words:  Rate-dependent, Tensile testing, Constitutive model, Strain rate, Poly(ethylene terephthalate) (PET)


Qiang Li, Shu-lian Liu, Shui-ying Zheng. Rate-dependent constitutive model of poly(ethylene terephthalate) for dynamic analysis[J]. Journal of Zhejiang University Science A, 2010, 11(10): 811-816.

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%A Qiang Li
%A Shu-lian Liu
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%DOI 10.1631/jzus.A1000182

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J0 - Journal of Zhejiang University Science A
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1000182


Abstract: 
Uniaxial tensile testing at strain rates ranging from 10−3 to 10−1 s−1 was carried out to study the rate-dependent mechanical behavior for poly(ethylene terephthalate) (PET) used in the packaging industry. The experimental results show that a rate-dependent plastic behavior exists for PET material. The value of the yield strength was found to increase with the increasing strain rate. A new constitutive model based on the improved Cowper-Symonds rate-dependent constitutive model is proposed to describe the mechanical behavior of PET material in the strain rate ranging from 10−3 to 10−1 s−1, providing more accurate material data for the subsequent simulation analysis of drop test and dynamic buckling. The predictions obtained using the proposed model are compared with experimental results of the improved Cowper-Symonds model. The simulating results of the proposed model agree well with the experimental data. For a low strain rate, the predictions of this model are more precise than those obtained using the improved Cowper-Symonds model. This confirms that the new constitutive model is suitable for describing the mechanical behavior of PET material at a low strain rate and modeling impact problem.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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