Identification of impact damage in sandwich structures by application of high speed MEMS-OSA to FBG sensors
Identification of impact damage in sandwich structures by application of high speed MEMS-OSA to FBG sensors
复制标题
通过将高速 MEMS-OSA 应用于 FBG 传感器来识别夹层结构中的冲击损伤
DOI：
10.1117/12.598333
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
N. Takeda
中科院分区：
文献类型：
--
作者：
Y. Okabe;S. Minakuchi;N. Takeda
在这项研究中，作者开发了各种特殊的损伤，如剥离和冲击损伤，在复合材料面板和铝蜂窝芯组成的夹层板与小直径光纤传感器的检测技术。首先，建立了两种剥离检测方法，利用芯和皮肤之间的粘合剂层上形成的圆角的行为。一种方法是利用光纤的断裂，另一种方法是利用光纤光栅（FBG）传感器的反射光谱的形状恢复，因为在圆角中的热残余应力的释放。其次，在冲击损伤方面，采用啁啾光纤光栅传感器监测面板在冲击载荷作用下产生的凹坑引起的应变分布变化。此外，一个新开发的MEMS光谱分析仪（MEMS-OSA）被引入到识别的碰撞点和损伤。该系统可以在很高的速度下测量反射光谱。发现在冲击载荷期间的反射谱的形式的变化根据冲击能量和冲击位置而不同，并且通过使用由箔应变计获得的应变分布的变化的理论模拟来确认这种趋势。这些结果表明，MEMS-OSA的反射光谱的高速测量有可能通过与理论模拟的比较来识别碰撞位置和损伤程度。
In this research, the authors developed various detection techniques for particular damages, such as debonding and impact damage, in sandwich panels consisting of composite face-sheets and aluminum honeycomb core with small-diameter optical fiber sensors. First, two methods for debonding detection were established taking advantage of the behavior of fillets formed on the adhesive layer between the core and the skin. One method uses the fracture of optical fibers, and the other one uses the shape recovery of the reflection spectrum from a fiber Bragg grating (FBG) sensor because of the release of thermal residual stress in the fillets. Secondly, as for impact damages, chirped FBG sensors were applied to monitor the change in strain distribution of the face-sheet due to the dent caused by the impact loadings. Furthermore, a newly developed MEMS-optical spectrum analyzer (MEMS-OSA) was introduced to identification of impact points and damages. This system could measure the reflection spectrum at very high speed. The change in the form of the reflection spectrum during the impact loading was found to be different depending on the impact energy and the impact location, and this tendency was confirmed by theoretical simulations using the change in the strain distribution obtained by foil strain gauges. These results show that the high speed measurement of the reflection spectrum by MEMS-OSA has a potential to identify the impact location and damage magnitude through the comparison with theoretical simulations.