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Detection of High-Velocity Impact Damage in Composite Laminates Using PVDF Sensor Signals  

Kim Jin-Won (충남대학교 대학원 항공우주공학과)
Kim In-Gul (충남대학교 항공우주공학과)
Publication Information
Composites Research / v.18, no.6, 2005 , pp. 26-33 More about this Journal
Abstract
The mechanical properties of composite materials may severely degrade in the presence of damage. Especially, the high-velocity impact such as bird strike, a hailstorm, and a small piece of tire or stone during high taxing, can cause considerable damage to the structures and sub-system in spite of a very small mass. However, it is not easy to detect the damage in composite plates using a single technique or any conventional methods. In this paper, the PVDF(polyvinylidene fluoride) film sensors were used for monitoring high-velocity impact damage initiation and propagation in composite laminates. The WT(wavelet transform) and STFT(short time Fourier transform) are used to decompose the sensor signals. A ultrasonic C-scan and a digital microscope are also used to examine the extent of the damage in each case. This research shows how various sensing techniques, PVDF sensor in particular, can be used to characterize high-velocity impact damage in advanced composite.
Keywords
high-velocity impact; damage detection; composite laminates; PVDF sensor;
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