Detection of Interlaminar Cracks in Composite Structures with the Use of Piezoelectric Sensors and Thermography

Abstract eng:
Delaminations are one of the most severe defects associated with multilayered laminated composite structures. Initiation of delamination and numerical analysis of delamination growth are presented. Results of damage detection in composite laminated panels are demonstrated with use of piezoelectric patches and thermography. Thermography is utilized to detect and visualize the size of delaminations. Damage detection in fiberreinforced composite laminated panels using Lamb waves (wave propagation) is demonstrated with the use of a sensor array. Experiments are conducted to empirically characterize the wave propagation behavior in a manufactured laminate. Piezoelectric patches are used as sensors and actuators in the experiments. Composite laminates are manufactured with an embedded defect to simulate inter-ply delamination.

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