Detection of disbonds in adhesively bonded aluminum plates using laser-generated shear acoustic waves
| Autor: | Matthew O'Donnell, Aleksandra Ziaja-Sujdak, Patrycja Pyzik, Ivan Pelivanov, Lukasz Ambrozinski, Jakub Spytek |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Shear waves
Optical fiber Materials science Inverse filter Multiphysics lcsh:QC221-246 02 engineering and technology 01 natural sciences law.invention 010309 optics law 0103 physical sciences Laser ultrasound lcsh:QC350-467 Radiology Nuclear Medicine and imaging Composite material Adhesive bonds Acoustic wave 021001 nanoscience & nanotechnology Laser Atomic and Molecular Physics and Optics lcsh:QC1-999 Shear (sheet metal) Interferometry lcsh:Acoustics. Sound 0210 nano-technology Longitudinal wave lcsh:Physics lcsh:Optics. Light Research Article |
| Zdroj: | Photoacoustics, Vol 21, Iss, Pp 100226-(2021) Photoacoustics |
| ISSN: | 2213-5979 |
| Popis: | Adhesively bonded metals are increasingly used in many industries. Inspecting these parts remains challenging for modern non-destructive testing techniques. Laser ultrasound (LU) has shown great potential in high-resolution imaging of carbon-reinforced composites. For metals, excitation of longitudinal waves is inefficient without surface ablation. However, shear waves can be efficiently generated in the thermo-elastic regime and used to image defects in metallic structures. Here we present a compact LU system consisting of a high repetition rate diode-pumped laser to excite shear waves and noncontact detection with a highly sensitive fiber optic Sagnac interferometer to inspect adhesively bonded aluminum plates. Multiphysics finite difference simulations are performed to optimize the measurement configuration. Damage detection is performed for a structure consisting of three aluminum plates bonded with an epoxy film. Defects are simulated by a thin Teflon film. It is shown that the proposed technique can efficiently localize defects in both adhesion layers. |
| Databáze: | OpenAIRE |
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