Creep Failure Characteristics and Mathematical Modeling of High-Density Polyethylene Geomembranes under High Stress Levels

To explore the creep characteristics of geomembrane under different tensile stresses, a series of creep tests were carried out on high-density polyethylene (HDPE) geomembrane specimens. For the interpretation and fitting of the experimental data, refined approximation functions were proposed. Partic...

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Veröffentlicht in:Polymers 2024-07, Vol.16 (14), p.2019
Hauptverfasser: Wang, Libo, Cen, Weijun, Bauer, Erich, Wei, Jiangliang, Wen, Zhenyu, Yan, Jun
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container_issue 14
container_start_page 2019
container_title Polymers
container_volume 16
creator Wang, Libo
Cen, Weijun
Bauer, Erich
Wei, Jiangliang
Wen, Zhenyu
Yan, Jun
description To explore the creep characteristics of geomembrane under different tensile stresses, a series of creep tests were carried out on high-density polyethylene (HDPE) geomembrane specimens. For the interpretation and fitting of the experimental data, refined approximation functions were proposed. Particular attention was paid to the creep failure behavior under high tensile stresses, i.e., 70%, 80%, and 90% of maximum peak stress. To investigate the effects of size on the mechanical response, experiments with two different membrane thicknesses were conducted. The results obtained under high stress levels were compared with creep tests at medium and low stress levels. Depending on load level, different creep characteristics can be distinguished. In the secondary creep state, the creep velocity is higher for higher load levels. In contrast to the medium and low load levels, the geomembrane under high stresses underwent the tertiary creep stage after instantaneous deformation and primary and secondary creep stages. In some tests, it was observed that under very high stress levels, creep velocity does not necessarily follow the expected trend and creep rupture can occur within a short time. For numerical simulation, an improved mathematical model was proposed to reproduce in a unified manner the experimental data of the whole non-linear evolution of creep elongation under different stress levels.
doi_str_mv 10.3390/polym16142019
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In some tests, it was observed that under very high stress levels, creep velocity does not necessarily follow the expected trend and creep rupture can occur within a short time. For numerical simulation, an improved mathematical model was proposed to reproduce in a unified manner the experimental data of the whole non-linear evolution of creep elongation under different stress levels.</description><identifier>ISSN: 2073-4360</identifier><identifier>EISSN: 2073-4360</identifier><identifier>DOI: 10.3390/polym16142019</identifier><identifier>PMID: 39065338</identifier><language>eng</language><publisher>Switzerland: MDPI AG</publisher><subject>Approximation ; Creep tests ; Deformation effects ; High density polyethylenes ; Mathematical analysis ; Mechanical analysis ; Polyethylene ; Polymers ; Strain hardening ; Stress concentration ; Stresses ; Viscoelasticity</subject><ispartof>Polymers, 2024-07, Vol.16 (14), p.2019</ispartof><rights>2024 by the authors. 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subjects Approximation
Creep tests
Deformation effects
High density polyethylenes
Mathematical analysis
Mechanical analysis
Polyethylene
Polymers
Strain hardening
Stress concentration
Stresses
Viscoelasticity
title Creep Failure Characteristics and Mathematical Modeling of High-Density Polyethylene Geomembranes under High Stress Levels
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