Robustness of a structural health monitoring system under drop-weight impact loading in composites

Pierre-Claude Ostiguy, Kyle Ryan Mulligan, Patrice Masson, and Saïd Elkoun
Submission Type: 
Full Paper
phmc_10_070.pdf140.25 KBOctober 12, 2010 - 7:23am

In this study, the robustness of a structural health monitoring system is tested on fiber glass composite coupons under impact testing using a drop-weight impact. The composite coupons are fitted with lead-zirconate-titanate (PZT) transducers to induce Lamb waves into the specimens. Robustness of the structural health monitoring system is assessed. The electrical admittance defined by the inverse of the impedance is chosen as the robustness metric and is measured using an LCR analyzer prior to, and following an impact event. Detachment of the PZT transducer is monitored through comparison of the measured electrical admittances. An average minimum composite coupon thickness of 7 mm is defined for impacting fiber glass composite coupons with pre-attached PZT transducers. A 1.5 % drop of electrical admittance was observed for that thickness for one impact. The chosen metric is related to the capability of the structural health monitoring system to provide accurate damage detection results following an impact.

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Submission Keywords: 
Prognostics Health Monitoring
Impedance Analyzer
Fibre Glass
Impact testing methods
PZT resin
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