Response of Mechanical Properties of Polyvinyl Chloride Geomembrane to Ambient Temperature in Axial Tension
Aiming at the mechanical response of geomembrane (GEM) in membrane-faced rockfill dam (MFRD) to different ambient temperatures, the mechanical properties in axial tension of polyvinyl chloride (PVC) GEM were studied by experiment and theoretical analysis. First, fifteen groups of axial tensile tests...
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MDPI AG
2021-11-01
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| author | Xianlei Zhang Zhongyang Ma Yunyun Wu Jianqun Liu |
| author_facet | Xianlei Zhang Zhongyang Ma Yunyun Wu Jianqun Liu |
| author_sort | Xianlei Zhang |
| collection | DOAJ |
| description | Aiming at the mechanical response of geomembrane (GEM) in membrane-faced rockfill dam (MFRD) to different ambient temperatures, the mechanical properties in axial tension of polyvinyl chloride (PVC) GEM were studied by experiment and theoretical analysis. First, fifteen groups of axial tensile tests for longitudinal/transverse specimens were conducted at different temperatures in the temperature environment laboratory, the stress–strain curve and Young’s modulus were obtained, and the variation of Young’s modulus with temperature was analyzed by Boltzmann function fitting. Second, the glass transition temperature of PVC GEM was obtained by differential scanning calorimetry (DSC), and the difference in mechanical properties between longitudinal and transverse specimens of PVC GEM was analyzed by thermomechanical analyzer (TMA) thermodynamic test. The results showed that the lower the temperature, the greater the Young’s modulus, and the smaller the linear interval of stress and strain, while the higher the temperature, the result is opposite. The difference in mechanical properties between the two directions is related to the ambient temperature. The orientation of polymer structure accounts for the difference in mechanical properties by theoretical analysis. The fitting results of Boltzmann function have a certain reference value for numerical simulation. In design of the membrane impervious structure in MFRD, the ambient temperature should be considered fully, and the longitudinal/transverse welding splicing should be avoided as far as possible. The current test specification should test the mechanical performance of GEM at normal operating temperature of reservoir instead of the test and quality evaluation at a single temperature. The temperature should be considered comprehensively in construction to avoid damaging the performance of impervious structure and ensure the service life. |
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| language | English |
| last_indexed | 2024-03-10T05:42:53Z |
| publishDate | 2021-11-01 |
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| spelling | doaj.art-123130b75657449694f0b4aad7bdfcbc2023-11-22T22:20:08ZengMDPI AGApplied Sciences2076-34172021-11-0111221086410.3390/app112210864Response of Mechanical Properties of Polyvinyl Chloride Geomembrane to Ambient Temperature in Axial TensionXianlei Zhang0Zhongyang Ma1Yunyun Wu2Jianqun Liu3School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaSchool of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaCollege of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210024, ChinaSchool of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaAiming at the mechanical response of geomembrane (GEM) in membrane-faced rockfill dam (MFRD) to different ambient temperatures, the mechanical properties in axial tension of polyvinyl chloride (PVC) GEM were studied by experiment and theoretical analysis. First, fifteen groups of axial tensile tests for longitudinal/transverse specimens were conducted at different temperatures in the temperature environment laboratory, the stress–strain curve and Young’s modulus were obtained, and the variation of Young’s modulus with temperature was analyzed by Boltzmann function fitting. Second, the glass transition temperature of PVC GEM was obtained by differential scanning calorimetry (DSC), and the difference in mechanical properties between longitudinal and transverse specimens of PVC GEM was analyzed by thermomechanical analyzer (TMA) thermodynamic test. The results showed that the lower the temperature, the greater the Young’s modulus, and the smaller the linear interval of stress and strain, while the higher the temperature, the result is opposite. The difference in mechanical properties between the two directions is related to the ambient temperature. The orientation of polymer structure accounts for the difference in mechanical properties by theoretical analysis. The fitting results of Boltzmann function have a certain reference value for numerical simulation. In design of the membrane impervious structure in MFRD, the ambient temperature should be considered fully, and the longitudinal/transverse welding splicing should be avoided as far as possible. The current test specification should test the mechanical performance of GEM at normal operating temperature of reservoir instead of the test and quality evaluation at a single temperature. The temperature should be considered comprehensively in construction to avoid damaging the performance of impervious structure and ensure the service life.https://www.mdpi.com/2076-3417/11/22/10864Young’s modulusmechanical propertiesPVC GEMambient temperatureMFRD |
| spellingShingle | Xianlei Zhang Zhongyang Ma Yunyun Wu Jianqun Liu Response of Mechanical Properties of Polyvinyl Chloride Geomembrane to Ambient Temperature in Axial Tension Applied Sciences Young’s modulus mechanical properties PVC GEM ambient temperature MFRD |
| title | Response of Mechanical Properties of Polyvinyl Chloride Geomembrane to Ambient Temperature in Axial Tension |
| title_full | Response of Mechanical Properties of Polyvinyl Chloride Geomembrane to Ambient Temperature in Axial Tension |
| title_fullStr | Response of Mechanical Properties of Polyvinyl Chloride Geomembrane to Ambient Temperature in Axial Tension |
| title_full_unstemmed | Response of Mechanical Properties of Polyvinyl Chloride Geomembrane to Ambient Temperature in Axial Tension |
| title_short | Response of Mechanical Properties of Polyvinyl Chloride Geomembrane to Ambient Temperature in Axial Tension |
| title_sort | response of mechanical properties of polyvinyl chloride geomembrane to ambient temperature in axial tension |
| topic | Young’s modulus mechanical properties PVC GEM ambient temperature MFRD |
| url | https://www.mdpi.com/2076-3417/11/22/10864 |
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