Title: LASER BOND INSPECTION VALIDATION
Authors: Sean K. Cossano, Kara M. Storage, Matthew R. Soja, Dr. Steven K. Brady
Abstract: The aerospace industry continuously strives to achieve more affordable, rate enabled, and more efficient composite structures. The full composite weight-saving benefits have not yet been realized for integrated structures because further research is needed to validate the strength of adhesively bonded joints. Robust nondestructive inspection (NDI) techniques to specifically assess bond strength would be an enabler and are needed to verify safety-of-flight-critical bonded structure for certification. Laser bond inspection (LBI) technology uses controlled high intensity stress waves formed by pulsed laser excitation as a method to assess and quantify the strength of bonded joints. The current validation effort has shown LBI can be used to reliably measure composite bond strength integrity in large, complex contoured structures. LBI results will be shown for two unique bonding systems, using a building block approach from flat panels to large integrated contoured wing skin panels. The data is correlated to the results of both static and fatigue mechanical coupon testing as well as controlled strength bond standards to define the LBI window of performance. Strategies and best practices for LBI implementation are being developed from thousands of laser bond inspections.
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Conference: SAMPE 2023
Publication Date: 2023/04/17
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