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This research experimentally examines the delamination process under both static and dynamic conditions in Mode I and Mode II. Adhesive joints composed of unidirectional carbon fiber reinforced epoxy laminates were assessed using Double Cantilever Beam (DCB) and End-Notched Flexure (ENF) tests. These joints, bonded with an epoxy adhesive, were exposed to a saline environment for degradation periods of 1 and 12 weeks, as well as evaluated in their unaged state. In the static analysis, maximum Gc values were calculated for both mode I (GIC) and mode II (GIIC) under different ageing conditions. Generated from experimental data, the G-da/dN curve was processed using a probabilistic model based on the Weibull distribution. Specifically for the fatigue initiation phase of the delamination process, the results reveal an infinite life limit around 20% for mode II and 25% mode I. During the crack growth phase, the crack propagation speeds are similar for the ageing conditions in mode I, being higher than those of the non-aged material. In contrast, for mode II, the crack propagation rates are high and do not show a clear trend.

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Impact of Saline Environment Exposure on the Fatigue Performance of Adhesive Joints in Carbon-Epoxy Composites Under Mode I and II Fracture Conditions

  • 会议论文

  • 发表日期：

    2025年

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  • Paula Vigón,
  • Antonio Argüelles,
  • Miguel Lozano,
  • Jaime Viña

摘要

This research experimentally examines the delamination process under both static and dynamic conditions in Mode I and Mode II. Adhesive joints composed of unidirectional carbon fiber reinforced epoxy laminates were assessed using Double Cantilever Beam (DCB) and End-Notched Flexure (ENF) tests. These joints, bonded with an epoxy adhesive, were exposed to a saline environment for degradation periods of 1 and 12 weeks, as well as evaluated in their unaged state. In the static analysis, maximum Gc values were calculated for both mode I (GIC) and mode II (GIIC) under different ageing conditions. Generated from experimental data, the G-da/dN curve was processed using a probabilistic model based on the Weibull distribution. Specifically for the fatigue initiation phase of the delamination process, the results reveal an infinite life limit around 20% for mode II and 25% mode I. During the crack growth phase, the crack propagation speeds are similar for the ageing conditions in mode I, being higher than those of the non-aged material. In contrast, for mode II, the crack propagation rates are high and do not show a clear trend.