Online detection of crack damage in composite plates using embedded piezoelectric actuators/sensors and wavelet analysis

摘要

The method for online detection of initial damage in composite structures proposed in this paper is based on energy variation of structural dynamic responses decomposed using wavelet analysis. It is much more sensitive than the existing methods, and it can detect extremely small cracks in composite plates. The results obtained in this study shown that the smallest detectable crack may reach the dimension of width 0.1 mm and length 2.3 mm, and the area containing this crack is only 0.06/100 of the total area of the plate. In addition, the piezoelectric smart materials embedded in the laminated composite structures are used as both actuators and sensors.