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17 April 2013 Detection of impact damage in composite panels using guided ultrasonic waves
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Composite materials such as carbon fiber reinforced panels offer many advantages for aerospace applications, e.g., good strength to weight ratio. However, impact during the operation and servicing of the aircraft can lead to barely visible and difficult to detect damage. Depending on the severity of the impact, fiber breakage or delaminations can be induced which reduce the functionality of the structure. Efficient structural health monitoring of such plate-like components can be achieved using guided ultrasonic waves propagating along the structure and covering critical areas. However, the guided wave propagation in such anisotropic and inhomogeneous materials needs to be understood from theory and verified experimentally to achieve sufficient coverage of the structure. Using non-contact laser interferometer measurements the guided wave propagation in carbon fiber reinforced panels was investigated experimentally. Impact damage was induced in the composite panels and the guided wave scattering at the damage measured and quantified. Good agreement with theoretical wave propagation predictions was found and barely visible impact damage in composite panels detected.
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Bibi Intan Suraya Murat and Paul Fromme "Detection of impact damage in composite panels using guided ultrasonic waves", Proc. SPIE 8695, Health Monitoring of Structural and Biological Systems 2013, 869506 (17 April 2013);

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