Low-velocity Impact Damdage Monitoring for Laminate Composite panels Using PVDF Sensor Signals and Acoustics Emission Signals

압전센서와 음향방출신호를 이용한 적층복합재 판재에 대한 저속 충격손상 모니터링

This paper studied the PVDF(polyvinylidene fluoride) and Acoustic Emission sensors characteristics of the laminated composite panels under the low velocity impact. The various impact test by changing impact height is performed on the instrumented drop weight impact tester. The STFT(short time Fourier transform) and WT(wavelet transform) are used to decompose the each sensor signals. A ultrasonic C-scan and digital scope are used to define damaged area in each case. The test result indicated that the individual sensor signals involve the damage initiation and development.