Abstract
Local Defect Resonance (LDR) is a promising approach to detect, localize, and visualise damage based on its resonant ultrasonic response. In this paper, the classical Rayleigh's method is applied for analytical evaluation of the fundamental frequencies of LDR for various shape planar defects in polymers and composite materials. A series of experiments implemented with simulated and realistic delaminations verifies the analytical formulas obtained and reveals the constraints for practical application of the theoretical approach. The case studies considered include some basic shapes of the defects to recognize the impact of the defect shape, size and position on LDR frequency. The expressions derived combined with the resonant imaging results address the reverse problem of characterizing the depth of the defect location.
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