Guided Wave Resonance to Identify Damage in Thin Composite Plates

This paper highlights guided wave resonance-based signature to detect damaged composite plates. Traditionally, guided wave probing is done with burst mode excitations and typically one requires high voltage pulser to generate short bursts. Power requirement can even go higher for probing sound absorbing materials like carbon or glass fiber composites. Here, we used low amplitude continuous waves to hit the resonance conditions in a composite plate to form interferometric resonance spectra that can be used to detect any damage in the plate. Thus, this may be useful for probing very high sound absorbing materials or where it is prohibited to use too much excitation voltages for safety reasons. The work also compares traditional burst mode based measurements for completeness of the study.