A New Structural Health Monitoring System for Composite Plate
Damage detection in composite materials can be divided into active and passive approaches. The active approach is usually based on various non-destructive techniques utilizing actuators and/or receivers. Simple laser scans, revealing the change in Lamb wave response amplitudes, have been used to locate delamination and estimate its severity in a composite plate. The validity of the proposed method is demonstrated through experimental studies in which input signals exerted at piezoelectric (PZT) patches on a composite plate are successfully reconstructed by using the time reversal method. The ultimate goal of this study is to develop a reference-free damage diagnosis technique based on the time reversal process so that defects can be identified without relying on any past baseline data.
Yanguo Shi and Jinlong Zuo
N. Z. Zhao and S. Yan, "A New Structural Health Monitoring System for Composite Plate", Advanced Materials Research, Vols. 183-185, pp. 406-410, 2011