This study focuses on an active monitoring method for damage detection applied to composite structures. Honeycomb sandwich and carbon fiber composite structures are studied. Two kinds of damage are considered: delamination and impact damage. Wavelet analysis methods are adopted to postprocess the raw monitored signal. A new damage signature is introduced to determine the presence and extent of damage in composites, while eliminating the influence of different distances between the active actuator and active monitoring elements. The proposed method is shown to be effective, reliable, and straightforward for the specimens considered in the present study, which are composed of different materials and suffer various levels of damage. An online real-time active monitoring system for damage detection is described that is based on this research.
Active Monitoring for On-Line Damage Detection in Composite Structures
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received Nov. 2001; Revised May 2002. Associate Editor: C. Farrar.
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Yuan, S., Lei, W., and Shi, L. (April 1, 2003). "Active Monitoring for On-Line Damage Detection in Composite Structures ." ASME. J. Vib. Acoust. April 2003; 125(2): 178–186. https://doi.org/10.1115/1.1547464
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