Abstract
Adhesively bonded metals are increasingly used in aerospace and automotive industries. Critical, load-bearing elements are often reinforced using stiffeners bonded to the main structure. Inspecting these parts remains challenging for modern non-destructive testing techniques. To some extent, high-frequency contact ultrasound probes can be used to detect defects between two plates. It appears, however, that the limited bandwidth of these systems cannot resolve multiple reflections and mode-conversions occurring at subsequent layers. Laser ultrasound (LU), due to its broadband nature, has shown great potential in high-resolution imaging of carbon-reinforced composites. For a metal surface, however, excitation of longitudinal waves in the normal direction is inefficient. On the other hand, shear waves can be efficiently generated using laser absorption and used to image defects in metallic structures. In this paper, we present the application of an LU system to detect damage in adhesively bonded aluminum plates. Laser-generated shear waves propagating into the structure at an oblique angle are back-reflected at discontinuities in the adhesive layer and detected on the surface. The distance between transmitter and receiver must be adjusted to maximize system sensitivity at a given depth. Here, we use finite difference (FD) simulations to optimize the measurement configuration.
How to Cite:
Ambrozi?ski, ?. ., Ziaja-Sujdak, A. ., Pyzik, P. ., O’Donnell, M. . & Pelivanov, I. ., (2019) “Detection of disbonds in adhesively bonded aluminum plates using laser ultrasound”, Review of Progress in Quantitative Nondestructive Evaluation .
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