Vigón Paula, Argüelles Antonio, Lozano Miguel, Viña Jaime
Department of Construction and Manufacturing Engineering, University of Oviedo, 33203 Gijón, Spain.
Department of Materials Science and Metallurgical Engineering, University of Oviedo, 33203 Gijón, Spain.
Materials (Basel). 2023 Dec 12;16(24):7606. doi: 10.3390/ma16247606.
This study investigates the fatigue delamination behavior of adhesive joints in epoxy carbon composite materials under Mode II fracture loading. The joints were characterized using the End-Notched Flexure (ENF) test, comprising adhesive joints formed by bonding two unidirectional carbon fiber epoxy matrix laminates with epoxy adhesive. These joints were subjected to different exposure periods (1, 2, 4, and 12 weeks) in a saline environment. Prior to dynamic fatigue testing, critical Mode II energy release rate values were determined through quasi-static tests, serving as a reference for subsequent fatigue characterization. This study aimed to comprehend how exposure duration to a saline environment affected the initial stage of fatigue delamination growth and employed a probabilistic model based on the Weibull distribution to analyze the experimental data. The results, gathered over a two-year experimental program, revealed varying behaviors in adhesive joint resistance to delamination based on exposure duration. A noteworthy reduction in fatigue strength capacity was observed, with fracture energies for infinite fatigue life reaching approximately 20% of their static loading capacity. This study sheds light on the deterioration of adhesive joints when exposed to a saline environment.
本研究调查了环氧碳复合材料中胶粘剂接头在II型断裂载荷下的疲劳分层行为。采用端部切口弯曲（ENF）试验对接头进行表征，该试验包括用环氧胶粘剂粘结两个单向碳纤维环氧基质层压板形成的胶粘剂接头。这些接头在盐环境中经历了不同的暴露时间（1、2、4和12周）。在动态疲劳试验之前，通过准静态试验确定临界II型能量释放率值，作为后续疲劳表征的参考。本研究旨在了解盐环境暴露持续时间如何影响疲劳分层生长的初始阶段，并采用基于威布尔分布的概率模型分析实验数据。在一个为期两年的实验项目中收集的结果表明，根据暴露持续时间的不同，胶粘剂接头抗分层的行为也有所不同。观察到疲劳强度能力有显著降低，无限疲劳寿命的断裂能量达到其静态加载能力的约20%。本研究揭示了胶粘剂接头在暴露于盐环境时的劣化情况。
