Strain Rate-Dependent Hyperbolic Constitutive Model for Tensile Behavior of PE100 Pipe Material
It is not conservative to directly use the strength tested under the laboratory loading rates to evaluate the long-term creep strength of polymers. A suitable strain rate-dependent constitutive model is crucial for accurately predicting the long-term strength and mechanical behavior of polymer press...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/7/1357 |
| _version_ | 1797438000918953984 |
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| author | Yan Li Wenbo Luo Maodong Li Bo Yang Xiu Liu |
| author_facet | Yan Li Wenbo Luo Maodong Li Bo Yang Xiu Liu |
| author_sort | Yan Li |
| collection | DOAJ |
| description | It is not conservative to directly use the strength tested under the laboratory loading rates to evaluate the long-term creep strength of polymers. A suitable strain rate-dependent constitutive model is crucial for accurately predicting the long-term strength and mechanical behavior of polymer pressure pipes. In this study, the Kondner hyperbolic constitutive model is considered the base model in deriving the rate-dependent constitutive model for PE100 pipe material, and the yield stress and initial tangent modulus are the two rate-dependent parameters of the model. Uniaxial tension tests are carried out under five specified strain rates ranging from 10<sup>−5</sup> s<sup>−1</sup> to 5 × 10<sup>−2</sup> s<sup>−1</sup> to obtain these two parameters. It is demonstrated that the strain rate dependence of the yield stress and the initial tangent modulus can be described by either a power or a logarithm law. The predictions from the two models are in good agreement with the experiments. In contrast, the power-law rate-dependent Kondner model is more suitable for describing the rate-dependent tensile behavior of PE100 pipe material than the logarithm-law rate-dependent Kondner model, especially for the cases of very low strain rates which relate to the polymer pressure pipe applications. |
| first_indexed | 2024-03-09T11:30:48Z |
| format | Article |
| id | doaj.art-b0d7991efe814b77a1978ef544fb9a06 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T11:30:48Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
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| series | Polymers |
| spelling | doaj.art-b0d7991efe814b77a1978ef544fb9a062023-11-30T23:53:21ZengMDPI AGPolymers2073-43602022-03-01147135710.3390/polym14071357Strain Rate-Dependent Hyperbolic Constitutive Model for Tensile Behavior of PE100 Pipe MaterialYan Li0Wenbo Luo1Maodong Li2Bo Yang3Xiu Liu4College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, ChinaDepartment of Civil Engineering, Changsha University, Changsha 410022, ChinaGuangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou 510663, ChinaGuangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou 510663, ChinaCollege of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, ChinaIt is not conservative to directly use the strength tested under the laboratory loading rates to evaluate the long-term creep strength of polymers. A suitable strain rate-dependent constitutive model is crucial for accurately predicting the long-term strength and mechanical behavior of polymer pressure pipes. In this study, the Kondner hyperbolic constitutive model is considered the base model in deriving the rate-dependent constitutive model for PE100 pipe material, and the yield stress and initial tangent modulus are the two rate-dependent parameters of the model. Uniaxial tension tests are carried out under five specified strain rates ranging from 10<sup>−5</sup> s<sup>−1</sup> to 5 × 10<sup>−2</sup> s<sup>−1</sup> to obtain these two parameters. It is demonstrated that the strain rate dependence of the yield stress and the initial tangent modulus can be described by either a power or a logarithm law. The predictions from the two models are in good agreement with the experiments. In contrast, the power-law rate-dependent Kondner model is more suitable for describing the rate-dependent tensile behavior of PE100 pipe material than the logarithm-law rate-dependent Kondner model, especially for the cases of very low strain rates which relate to the polymer pressure pipe applications.https://www.mdpi.com/2073-4360/14/7/1357high-density polyethylenerate dependencehyperbolic constitutive modelyield stressyield straininitial tangent modulus |
| spellingShingle | Yan Li Wenbo Luo Maodong Li Bo Yang Xiu Liu Strain Rate-Dependent Hyperbolic Constitutive Model for Tensile Behavior of PE100 Pipe Material Polymers high-density polyethylene rate dependence hyperbolic constitutive model yield stress yield strain initial tangent modulus |
| title | Strain Rate-Dependent Hyperbolic Constitutive Model for Tensile Behavior of PE100 Pipe Material |
| title_full | Strain Rate-Dependent Hyperbolic Constitutive Model for Tensile Behavior of PE100 Pipe Material |
| title_fullStr | Strain Rate-Dependent Hyperbolic Constitutive Model for Tensile Behavior of PE100 Pipe Material |
| title_full_unstemmed | Strain Rate-Dependent Hyperbolic Constitutive Model for Tensile Behavior of PE100 Pipe Material |
| title_short | Strain Rate-Dependent Hyperbolic Constitutive Model for Tensile Behavior of PE100 Pipe Material |
| title_sort | strain rate dependent hyperbolic constitutive model for tensile behavior of pe100 pipe material |
| topic | high-density polyethylene rate dependence hyperbolic constitutive model yield stress yield strain initial tangent modulus |
| url | https://www.mdpi.com/2073-4360/14/7/1357 |
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