Real-time Detection of Debonding between Honeycomb Core and Facesheet using a Small-diameter FBG Sensor Embedded in Adhesive Layer
Real-time Detection of Debonding between Honeycomb Core and Facesheet using a Small-diameter FBG Sensor Embedded in Adhesive Layer
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DOI：
10.1177/1099636207064457
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发表时间：
2007-01
影响因子：
3.9
通讯作者：
S. Minakuchi;Y. Okabe;N. Takeda
中科院分区：
文献类型：
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作者：
S. Minakuchi;Y. Okabe;N. Takeda
作者开发了一种新技术，使用小直径光纤布拉格光栅 (FBG) 传感器来检测蜂窝夹层结构中的脱粘。在粘合层的固化过程中，将小直径FBG传感器嵌入到芯材和面板之间的粘合层中。固化过程后，小直径 FBG 传感器的反射光谱会失真，因为圆角的形成会导致粘合层中的应变分布不均匀。然而，脱粘后，带有圆角的芯材从面板上剥离，结果，反射光谱由于非均匀应变的释放而恢复其原始形状。因此，可以根据反射光谱形状的恢复以高灵敏度实时检测脱粘。此外，还提出了一种使用小直径啁啾FBG传感器的更可靠的脱粘检测技术，其中反射光谱中的两个指标已成功地用于更可靠的脱粘判断。
The authors have developed a novel technique to detect debonding in honeycomb sandwich structures using small-diameter fiber Bragg grating (FBG) sensors. A small-diameter FBG sensor is embedded in the adhesive layer between the core and the facesheet during the curing process of the adhesive layer. After the curing process, the reflection spectrum from the small-diameter FBG sensor is distorted because the formation of fillets induces a non-uniform strain distribution in the adhesive layer. However, after debonding, the core with the fillets peels off the facesheet, and, as a result, the reflection spectrum recovers its original shape due to the release of the non-uniform strain. Debonding can thus be detected with high sensitivity in real time from the recovery in the shape of the reflection spectrum. In addition, a more reliable debonding detection technique using a small-diameter chirped FBG sensor is proposed, in which two indicators in the reflection spectrum have been successfully used for a more reliable judgment of debonding.