Interlayer Defect Detection in Intra-Ply Hybrid Composite Material (GF/CF) Using a Capacitance-Based Sensor.
Interlayer Defect Detection in Intra-Ply Hybrid Composite Material (GF/CF) Using a Capacitance-Based Sensor.
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DOI：
10.3390/s22082966
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发表时间：
2022-04-13
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当结构承受较低的应力水平时，将两种类型的增强纤维组合在一个共同的基体中可能会导致不同的失效模式，例如层之间的微裂纹。应将实时损伤检测集成到混合复合材料结构中，以提供结构完整性并缓解此问题。本文概述了层内混合复合材料（2 × 2 斜纹组织）中集成电容传感器的工作机制和制造。进行单轴拉伸和弯曲测试来表征所提出的传感器并提供自传感功能（智能结构）。测得电容式传感器的灵敏度和重复性分别约为 1.3 和 185 µΔC/Co。结果表明，层间损坏的发生可以通过现场监测来检测。可以看出，初始损坏是在电容相对变化随着负载增加而开始减小的转折点处检测到的。还构建了有限元模型来分析测试结果并解释转折点背后的原因。结果表明，碳纱在卷曲区域经历了高横向剪切应力（τxz），导致纤维间裂纹。
Combining two types of reinforcement fiber in a common matrix may lead to different failure modes such as micro-cracks between the layers when the structure is subjected to lower stress levels. Real-time damage detection should be integrated into the hybrid composite structure to provide structural integrity and mitigate this problem. This paper outlines the working mechanisms and the fabrication of an integrated capacitive sensor in an intra-ply hybrid composite (2 × 2 twill weave). Uniaxial tensile and flexural tests were conducted to characterize the proposed sensor and provide self-sensing functionality (smart structure). The sensitivity and repeatability of the capacitive sensor were measured to be around 1.3 and 185 µΔC/Co, respectively. The results illustrate that onset of damage between layers can be detected by in situ monitoring. It can be seen that the initial damage was detected at the turning point where the relative change in capacitance begins to reduce while the load increases. Finite element modeling was also constructed to analyze the test results and explain the reasons behind the turning point. It was shown that the carbon yarns experienced high transverse shear stress (τxz) in the crimp region, leading to inter-fiber cracks.
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