| Rate-dependent constitutive model of poly（ethylene terephthalate） for dynamic analysis |
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| 作者姓名： | Qiang LI Shu-lian LIU Shui-ying ZHENG |
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| 作者单位： | [1]Institute of Chemical Machinery, Zhejiang University, Hangzhou 310027, China [2]Department of Electro-Mechanical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China |
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| 基金项目： | Project （No. 2008C11005） supported by the Key Science and Technology Program of Zhejiang Province, China |
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| 摘 要： | Uniaxial tensile testing at strain rates ranging from 10-3 to 10-1 s-1 was carried out to study the rate-dependent me-chanical 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 me-chanical behavior of PET material at a low strain rate and modeling impact problem.
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| 关 键 词： | 对苯二甲酸乙二醇酯 本构模型 率相关 材料力学行为 PET材料 单轴拉伸试验 动态模拟分析 低应变速率 |
| 收稿时间： | 23 February 2004 |
Rate-dependent constitutive model of poly(ethylene terephthalate) for dynamic analysis |
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| 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,2010,11(10):811-816. |
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| Authors: | Qiang Li Shu-lian Liu and Shui-ying Zheng |
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| Institution: | (1) Laboratory of Food Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece; |
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| 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. |
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| Keywords: | Rate-dependent Tensile testing Constitutive model Strain rate Poly（ethylene terephthalate） （PET） |
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