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A performance-based characterisation of CFRP composite deterioration using active infrared thermography

机译：主动红外热成像技术基于性能的CFRP复合材料劣化表征

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This study explores the effect of sulphuric acid (H2SO4) on the physical and mechanical properties of carbon fibre-reinforced polymer (CFRP) and its constituent elements including epoxy resin and fibrous reinforcement. Specimens are exposed to decreasing pH levels through an accelerated aging regime and subsequently tested by mechanical and non-destructive methods. Active infrared thermography is applied to develop a quantitative framework for material degradation. The effect of acid exposure is subsequently assessed through a performance criterion based on thermal energy variation. Microscopic analyses through scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) reveal the material degradation and impact of acid at the fibreepoxy interface. Tensile testing on FRP and epoxy resin coupons indicate up to 25% reduction in strength. An acid attack model is developed for the environmental reduction factor (CE) that is shown to compare well with experimental data. The performance-based environmental reduction factor presented expands our understanding of the FRP material response to aggressive environments and its effectiveness during the in-service life of structure.
机译：本研究探讨了硫酸（H2SO4）对碳纤维增强聚合物（CFRP）及其组成元素（包括环氧树脂和纤维增强材料）的物理和机械性能的影响。标本通过加速老化过程暴露于降低的pH值，随后通过机械和非破坏性方法进行测试。主动红外热成像技术可用于开发定量降解材料的框架。随后通过基于热能变化的性能标准评估酸暴露的影响。通过扫描电子显微镜（SEM）和能量色散X射线光谱仪（EDS）进行的显微镜分析揭示了纤维降解的材料降解和酸在纤维氧合界面上的影响。在FRP和环氧树脂试片上进行拉伸测试表明强度降低了25％。针对环境降低因子（CE）开发了一种酸攻击模型，该模型可与实验数据很好地进行比较。提出的基于性能的环境减少因素扩展了我们对FRP材料对侵蚀性环境的反应及其在结构使用寿命中的有效性的理解。

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