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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Autores principales:	Xianlei Zhang, Zhongyang Ma, Yunyun Wu, Jianqun Liu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Young’s modulus mechanical properties PVC GEM ambient temperature MFRD Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/123130b75657449694f0b4aad7bdfcbc
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spelling	oai:doaj.org-article:123130b75657449694f0b4aad7bdfcbc2021-11-25T16:39:33ZResponse of Mechanical Properties of Polyvinyl Chloride Geomembrane to Ambient Temperature in Axial Tension10.3390/app1122108642076-3417https://doaj.org/article/123130b75657449694f0b4aad7bdfcbc2021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10864https://doaj.org/toc/2076-3417Aiming 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.Xianlei ZhangZhongyang MaYunyun WuJianqun LiuMDPI AGarticleYoung’s modulusmechanical propertiesPVC GEMambient temperatureMFRDTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10864, p 10864 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Young’s modulus mechanical properties PVC GEM ambient temperature MFRD Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	Young’s modulus mechanical properties PVC GEM ambient temperature MFRD Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Xianlei Zhang Zhongyang Ma Yunyun Wu Jianqun Liu Response of Mechanical Properties of Polyvinyl Chloride Geomembrane to Ambient Temperature in Axial Tension
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.
format	article
author	Xianlei Zhang Zhongyang Ma Yunyun Wu Jianqun Liu
author_facet	Xianlei Zhang Zhongyang Ma Yunyun Wu Jianqun Liu
author_sort	Xianlei Zhang
title	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_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_sort	response of mechanical properties of polyvinyl chloride geomembrane to ambient temperature in axial tension
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/123130b75657449694f0b4aad7bdfcbc
work_keys_str_mv	AT xianleizhang responseofmechanicalpropertiesofpolyvinylchloridegeomembranetoambienttemperatureinaxialtension AT zhongyangma responseofmechanicalpropertiesofpolyvinylchloridegeomembranetoambienttemperatureinaxialtension AT yunyunwu responseofmechanicalpropertiesofpolyvinylchloridegeomembranetoambienttemperatureinaxialtension AT jianqunliu responseofmechanicalpropertiesofpolyvinylchloridegeomembranetoambienttemperatureinaxialtension
_version_	1718413061068423168

Response of Mechanical Properties of Polyvinyl Chloride Geomembrane to Ambient Temperature in Axial Tension

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