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<p>Quantifying defect expansion and strain concentration is crucial for understanding high-density polyethylene (HDPE) geomembrane failure under tensile stress. This study employed digital image correlation (DIC) to monitor real-time deformation in geomembranes with different defect sizes and strain rates under uniaxial tensile loading, complemented by microstructural analysis. Results show that larger defects reduce peak stress, peak strain, break strain, and initial elastic modulus, while higher strain rates enhance peak stress and initial elastic modulus. The extended Duncan-Chang model effectively characterizes the stress-strain response of both intact and defected geomembranes. Defect expansion is primarily governed by axial tensile strain rather than the initial defect size, with a normalized index, <i>A</i><sub>r</sub>, mapping its progression. A critical strain threshold for rapid defect growth, identified via DIC displacement fields, aligns with the farthest point method. Strain concentration exhibits a butterfly-type distribution, intensifying with larger defects but remaining independent of strain rate. Microstructural analysis reveals that increasing defect size amplifies local stress concentration, accelerates crack propagation, and leads to a smoother, more aggregated fracture pattern, resembling the effects of increasing strain rate. These findings aim to provide a quantitative framework for assessing strain concentration and defect evolution, offering valuable insights for HDPE geomembrane design, structural integrity, and leakage prevention.</p>

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Strain Field Evolution and Defect Expansion of HDPE Geomembranes with Circular Defect: Effects of Defect Size and Strain Rate

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Jiangtao He,
  • Fengyin Liu,
  • Jilong Zhao,
  • Hua Liu,
  • Songhe Wang

摘要

Quantifying defect expansion and strain concentration is crucial for understanding high-density polyethylene (HDPE) geomembrane failure under tensile stress. This study employed digital image correlation (DIC) to monitor real-time deformation in geomembranes with different defect sizes and strain rates under uniaxial tensile loading, complemented by microstructural analysis. Results show that larger defects reduce peak stress, peak strain, break strain, and initial elastic modulus, while higher strain rates enhance peak stress and initial elastic modulus. The extended Duncan-Chang model effectively characterizes the stress-strain response of both intact and defected geomembranes. Defect expansion is primarily governed by axial tensile strain rather than the initial defect size, with a normalized index, Ar, mapping its progression. A critical strain threshold for rapid defect growth, identified via DIC displacement fields, aligns with the farthest point method. Strain concentration exhibits a butterfly-type distribution, intensifying with larger defects but remaining independent of strain rate. Microstructural analysis reveals that increasing defect size amplifies local stress concentration, accelerates crack propagation, and leads to a smoother, more aggregated fracture pattern, resembling the effects of increasing strain rate. These findings aim to provide a quantitative framework for assessing strain concentration and defect evolution, offering valuable insights for HDPE geomembrane design, structural integrity, and leakage prevention.