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1 April 2019 Guided wave techniques for damage detection and property characterization in composite aerospace structures
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Composite materials make up an increasing portion of today’s aerospace structures (see, e.g. Boeing 787 and Airbus 380). These aircrafts’ fuselage, for example, is composed of a laminated composite skin connected to composite stringers and C-frames. Of primary importance is the detection of damage in these built-up structures, whether caused by the manufacturing process or in service (e.g. impacts). A related issue is the characterization of the composite elastic mechanical properties, that can also be related to the quantification of potential damage. Guided elastic waves propagating in the ~100s kHz regime lend themselves to provide the necessary sensitivity to these two conditions (damage and mechanical properties). This presentation will discuss the use of these waves to provide information on both damage and mechanical properties of composite structures that are typically used in modern commercial aircraft fuselages. In particular, a scanning system using air-coupled ultrasonic transducers and transfer function reconstruction will be presented for the detection and the quantification of impact-induced damage in laboratory test panels representative of fuselage construction. An optimization scheme that uses Simulated Annealing and the Semi-Analytical Finite Element (SAFE) technique as the forward model will be used to identify the layer-by-layer elastic properties of the composite skin laminate by observation of the guided wave phase velocity dispersive behavior.
Conference Presentation
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Margherita Capriotti, Ranting Cui, and Francesco Lanza di Scalea "Guided wave techniques for damage detection and property characterization in composite aerospace structures", Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 1097204 (1 April 2019);

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