Impact Monitoring of CFRP with Fiber Bragg Grating Sensor
LU Ji-yun,LIANG Da-kai,LU Guan,ZENG Jie
The Aeronautical Science Key Laboratory for Smart Material and Structures, Nan Jing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016,China
Abstract：Fiber Bragg grating (FBG) is applied for the impact-related experiments of carbon fiber reinforced plastics (CFRP) and impact monitoring system is built. FBG sensors are stuck on the CFRP to setup network, impact response signal measured by same FBG is analyzed for different impact location. The resonant frequency of CFRP is 53Hz and 100Hz, which amplitude of different resonant frequency is changed with location of impact. When CFRP laminate is impact, impact response signals using FBG sensors network is analyzed by wavelet packet decomposition and wavelet packet energy spectrum is obtained. The results show the sixth order wavelet packet energy monitored by FBG sensors change obviously and the energy not only is related to distance from impact point to FBG sensor but also is related to the angle between impact point and axial of FBG sensor. The research provides a practical reference in dynamic monitoring of CFRP dynamic monitoring field.
［1］Tsuda H, Lee J R. Strain and damage monitoring of CFRP in impact loading using a fiber Bragg grating sensor system［J］. Composites Science and Technology, 2007, 67:1353-1352.
［2］Lee J R, Tsuda H, Toyama N. Impact wave and damage detections using a strain-free fiber Bragg grating ultrasonic receiver［J］. NDT&E International, 2007,40:85-93.
［3］Wang B, et al. Development of a remote impact damage identification system［J］. Structure Control Health Monitor, 2005,12(3/4):301-314.
［4］Chen P U, Shen Z, Wang J Y. A new method for compression after impact strength prediction of composite laminates ［J］. Journal of Composite Materials,2002, 36 (5):589-610.
［5］袁慎芳,Fahard Ansari,刘小会. 基于光纤传感器的行驶车辆动态载荷监测技术［J］.计量学报,2005, 26(4):343 -346.
［6］Glossop N D W, et al. Optical fiber damage detection for an aircraft composite leading edge［J］. Composites, 1990,21(1):71-80.
［7］江毅,黄俊斌. 分时复用光纤光栅振动传感器阵列［J］.光子学报,2008,37(1):73-74.
［8］杨大智,关铁梁.智能材料与智能系统［M］.天津:天津大学出版社,2000:73-82.
［9］王彦,梁大开,周兵. 光纤光栅型智能结构损伤识别的小波包分析［J］.光学精密工程,2007,15（11）:1732-1733.
2011, Vol. 32 
