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Nonlinear vibro-acoustic inspection and localization of precursor damage in composite aeronautic structures

Technological challenge: Factory of the future incl. robotics and non destructive testing (learn more)

Department: Département Imagerie Simulation pour le Contrôle (LIST)

Laboratory: Laboratoire Méthodes CND

Start Date: 01-10-2022

Location: Saclay

CEA Code: SL-DRT-22-0665

Contact: guillemette.ribay@cea.fr

For safety reasons, aeronautic composite structures are monitored throughout their life. In particular, they undergo fatigue or impacts likely to generate damages which, if not diagnosed in time, can lead to failure. As a complement to imaging algorithms exploiting guided ultrasonic waves that interact with defects in the structure, non-linear vibro-acoustic methods exploit the non-linear interaction of a vibrating structure combined with the generation of ultrasonic waves with precursor defects. The objective of this thesis is to develop algorithms adapted to a low-intrusive measurement device, allowing the detection of the low-amplitude non-linear signature of a defect, and able to localize the latter. In addition, a numerical model of the propagation and interaction of waves with damage in a thin composite structure will be studied to support the choice of algorithms and to assist in the design of an experimental device.

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