Fromme, P; (2018) Guided Wave Propagation and Scattering in Aerospace Composite Panels. In: 9th European Workshop on Structural Health Monitoring (EWSHM 2018), July 10-13, 2018 in Manchester, UK (EWSHM 2018). NDT.net: Manchester, UK.

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Abstract

Carbon fiber laminate composites, consisting of layers of polymer matrix reinforced with high strength carbon fibers, are increasingly employed for aerospace structures. They offer 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, delaminations can occur, reducing the load carrying capacity of the structure. Efficient structural health monitoring of composite panels can be achieved using guided ultrasonic waves propagating along the structure. The guided ultrasonic wave (A0 Lamb wave mode) propagation and scattering at delaminations was modelled using full three-dimensional Finite Element (FE) simulations. Impact damage was induced in the composite panels using standard drop weight procedures. Ultrasonic immersion C-scans were performed to quantify the extent and shape of delamination due to the impact. The guided wave scattering at the impact damage was measured using a noncontact laser interferometer, quantified, and compared to baseline measurements on an undamaged part of the composite panel. Good agreement between experiments and FE predictions was found. The sensitivity of guided waves for the detection of barely visible impact damage in composite panels has been verified.

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