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<p>Delamination constitutes a critical failure mechanism in composite structures under impact conditions, significantly compromising structural integrity through progressive interfacial energy dissipation. An understanding of dynamic delamination and fracture behavior of UHMWPE laminates is developed in this study, with focus on the influence of loading rates and specimen configurations. A specialized test apparatus combined with optimized wedge-insert double cantilever beam specimens and high-speed optical imaging is formulated to characterize deformation and crack propagation. Results show that UHMWPE laminates exhibit significant nonlinearity during fracture, attributed to the inherent ductility and plastic deformation, distinct from brittle composites. Specimen thickness and interlaminar ply orientation considerably affect fracture responses. The 90°/90° interfacial configuration effectively suppressed fiber bridging and crack migration, while increased thickness reduces plastic artifacts, ensuring measurement of intrinsic toughness and reproducibility. The fracture toughness demonstrates strong loading-rate dependence, with noticeable enhancement at high loading rates. A rate-dependent cohesive zone model is developed and validated. The close correspondence between numerical and experimental results confirms the quantitative accuracy and mechanistic fidelity. The findings provide experimental references and theoretical support for determining delamination behavior of ballistic composites, with direct relevance to performance evaluation and lightweight design.</p>

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On Dynamic Delamination and Fracture Behavior of Ultra-High Molecular Weight Polyethylene Fiber Reinforced Composite Laminates

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Jian Deng,
  • Pengcheng Xiao,
  • Dake Wu,
  • Jiagui Liu,
  • Jinling Gao,
  • Xinwei Wang

摘要

Delamination constitutes a critical failure mechanism in composite structures under impact conditions, significantly compromising structural integrity through progressive interfacial energy dissipation. An understanding of dynamic delamination and fracture behavior of UHMWPE laminates is developed in this study, with focus on the influence of loading rates and specimen configurations. A specialized test apparatus combined with optimized wedge-insert double cantilever beam specimens and high-speed optical imaging is formulated to characterize deformation and crack propagation. Results show that UHMWPE laminates exhibit significant nonlinearity during fracture, attributed to the inherent ductility and plastic deformation, distinct from brittle composites. Specimen thickness and interlaminar ply orientation considerably affect fracture responses. The 90°/90° interfacial configuration effectively suppressed fiber bridging and crack migration, while increased thickness reduces plastic artifacts, ensuring measurement of intrinsic toughness and reproducibility. The fracture toughness demonstrates strong loading-rate dependence, with noticeable enhancement at high loading rates. A rate-dependent cohesive zone model is developed and validated. The close correspondence between numerical and experimental results confirms the quantitative accuracy and mechanistic fidelity. The findings provide experimental references and theoretical support for determining delamination behavior of ballistic composites, with direct relevance to performance evaluation and lightweight design.