- Conference date: 22–27 July 2007
- Location: Golden (Colorado)
Bonded aluminum structures have been commonly used on aircraft for many years, and many of these applications include flight control surfaces. These bonded structures can be made up of aluminum face sheets adhesively bonded to a central honeycomb core, or they could also be composed of machined components that are bonded in a tongue‐in‐groove type manner called Grid‐Lock. Nondestructive Inspection (NDI) methods of bonded aluminum structures usually involve the detection of skin‐to‐core disbonds, core buckling and damage caused by impacts. In the case of Grid‐Lock, NDI techniques are focused on the detection of failures in the tongue‐in‐groove adhesive joint. Three nondestructive inspection methods were applied to honeycomb sandwich structures and Grid‐Lock panels. The three methods were computer aided tap test (CATT), air‐coupled ultrasonic testing (ACUT), and mechanical impedance analysis (MIA). The honeycomb structures tested consisted of structural panels and flight control surfaces from various aircraft. The Grid‐Lock samples tested are laboratory specimens that simulate various defects. Experimental results and comparisons from each of these methods and samples will be presented.
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