Investigation on PVDE & PZT Sensor Signals for the Low-Velocity Impact Damage of Gr/Ep Composite Laminates

복합적층판의 저속충격손상에 따른 PZT 센서와 PVDF 센서의 신호 분석

  • 이홍영 (충남대학교 항공우주공학과) ;
  • 김진원 (충남대학교 항공우주공학) ;
  • 최정민 (충남대학교 항공우주공학) ;
  • 김인걸 (충남대학교 항공우주공학과)
  • Published : 2003.04.01

Abstract

Low-velocity impact damage is a major concern in the design of structures made of composite materials, because impact damage is hidden inside and cannot be detected by visual inspection. The piezoelectric thin film sensor can be used to detect variations in structural and material properties for structural health monitoring. In this paper, the PVDF and PZT sensors were used for monitoring impact damage initiation in Gr/Ep composite panel to illustrate this potential benefit. A series of impact test at various impact energy by changing impact mass and height is performed on the instrumented drop weight impact tester. The wavelet transform(WT) is used to decompose the piezoelectric sensor signals in this study. Test results show that the particular waveform of sensor signals implying the damage initiation and development are detected above the damage initiation impact energy. And it is found that both PZT and PVDF sensors can be used to detect the impact damage.

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