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| 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 |
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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.
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2011, Vol. 32 
