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<p>This study investigates the influence of water absorption on mode II delamination of Araldite 2015 adhesive bonded to T600S/R368-1 carbon/epoxy composites. Specimens were conditioned at 70&#xa0;°C in demineralized water to achieve moisture contents of 0%, 2.2%, and 5.3%, and tested using an end-notched flexure (ENF) configuration. Results reveal a pronounced reduction in mode II fracture toughness (<i>G</i><sub><i>IIC</i></sub>), retaining only ~ 30% of its initial value at both moisture levels. Residual Property Model fitting indicates a high sensitivity to moisture, with degradation parameter <i>ζ</i> = 0.06. Additionally, Continuum Damage Modeling (CDM) accurately reproduced experimental force–displacement curves, validating its predictive capability. Finally, fractographic analysis shows a transition from interfacial cohesive failure under dry conditions to mixed cohesive–adhesive failure in wet specimens.</p>

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Effect of Water Absorption on Mode II Delamination of Adhesively Bonded Carbon/Epoxy Composites: Experimental Study and Continuum Damage Modeling

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • K. J. Wong,
  • H. A. Israr,
  • M. N. Tamin

摘要

This study investigates the influence of water absorption on mode II delamination of Araldite 2015 adhesive bonded to T600S/R368-1 carbon/epoxy composites. Specimens were conditioned at 70 °C in demineralized water to achieve moisture contents of 0%, 2.2%, and 5.3%, and tested using an end-notched flexure (ENF) configuration. Results reveal a pronounced reduction in mode II fracture toughness (GIIC), retaining only ~ 30% of its initial value at both moisture levels. Residual Property Model fitting indicates a high sensitivity to moisture, with degradation parameter ζ = 0.06. Additionally, Continuum Damage Modeling (CDM) accurately reproduced experimental force–displacement curves, validating its predictive capability. Finally, fractographic analysis shows a transition from interfacial cohesive failure under dry conditions to mixed cohesive–adhesive failure in wet specimens.