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Guided Wave Propagation through Composite Bonded Joints

Abstract : Bonding of composite structures is regularly used in aerospace industry to restore structural integrity in repair or assemble sub-structures. This structural feature is prone to degradation with improper installation or disbond when submitted to fatigue or extreme strains. Therefore, non-destructive evaluation (NDE) should be considered to inspect adhesive bonded joints. In comparision with traditional NDE, a built-in structural health monitoring (SHM) would be more desirable to save the inspection cost as well as improve safety. The objective of this research is to evaluate integrity of composite bonded joints using guided wave propagation technique. Two carbon fiber reinforced polymer (CFRP) are bonded together using adhesive film and artificial disbond is introduced by a circular Teflon tape. A rectangular piezoceramic is used to generate plane guided waves and non-contact measurement is performed using 3-D Laser Doppler Vibrometer to extract the required information for evaluation of quality of bond line. Results have shown that the joint can be charactized using guided wave behavior, and reflection and transmision coefficients for incident A0 and S0 modes are extracted in order to design the final SHM system.
Keywords : Guided waves
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https://hal.inria.fr/hal-01022039
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Submitted on : Thursday, July 10, 2014 - 9:58:37 AM
Last modification on : Wednesday, February 10, 2021 - 10:32:06 AM
Long-term archiving on: : Friday, October 10, 2014 - 10:57:26 AM

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Mohammad Hossein Sherafat, Nicolas Quaegebeur, Larry Lessard, Pascal Hubert, Patrice Masson. Guided Wave Propagation through Composite Bonded Joints. EWSHM - 7th European Workshop on Structural Health Monitoring, IFFSTTAR, Inria, Université de Nantes, Jul 2014, Nantes, France. ⟨hal-01022039⟩

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