Rito Rodolfo L, Ogin Stephen L, Crocombe Andrew D
Department of Mechanical Engineering Sciences, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford U2 7XH, UK.
Sensors (Basel). 2021 Feb 7;21(4):1168. doi: 10.3390/s21041168.
In this paper, chirped fibre Bragg grating (CFBG) sensors used to monitor the structural health of a composite patch used to repair an aluminium panel is presented. To introduce damage, a notch was produced at the centre of an aluminium panel. The repair consisted of bonding a pre-cured composite patch to the host panel using an aerospace-grade film adhesive; the sensor was embedded in the bond-line during fabrication of the repair. The repaired panels were subjected to tension-tension loading in fatigue. Cracks initiated and grew from both ends of the notch in the aluminium panels and the fatigue loading was stopped periodically for short periods of time to record the reflected spectra from the sensor. It was found that perturbations in the reflected spectra began to occur when the crack was within about 2 to 3 mm of the sensor location; after the crack passed the sensor location, the perturbations essentially stabilised. Predicted reflected spectra have been found to be in good agreement with the experiment, confirming that CFBG sensors can detect crack growth in patch-repaired panels.
本文介绍了用于监测用于修复铝板的复合补片结构健康状况的啁啾光纤布拉格光栅（CFBG）传感器。为了引入损伤，在铝板中心制作了一个切口。修复工作包括使用航空级薄膜粘合剂将预固化的复合补片粘结到主体板上；在修复制造过程中，传感器被嵌入粘结层中。修复后的面板承受疲劳拉伸-拉伸载荷。铝板切口两端开始出现裂纹并扩展，疲劳加载会定期短暂停止，以记录传感器的反射光谱。研究发现，当裂纹距离传感器位置约2至3毫米时，反射光谱开始出现扰动；裂纹通过传感器位置后，扰动基本稳定。已发现预测的反射光谱与实验结果吻合良好，证实CFBG传感器能够检测补片修复面板中的裂纹扩展。
