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Proceedings Paper

A guided-wave system for monitoring the wing skin-to-spar bond in unmanned aerial vehicles
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Paper Abstract

Unmanned Aerial Vehicles (UAVs) are being increasingly used in military as well as civil applications. A critical part of the structure is the adhesive bond between the wing skin and the supporting spar. If not detected early, bond defects originating during manufacturing or in service flight can lead to inefficient flight performance and eventual global failure. This paper will present results from a bond inspection system based on attached piezoelectric disks probing the skin-to-spar bondline with ultrasonic guided waves in the hundreds of kilohertz range. The test components were CFRP composite panels of two different fiber layups bonded to a CFRP composite tube using epoxy adhesive. Three types of bond conditions were simulated, namely regions of poor cohesive strength, regions with localized disbonds and well bonded regions. The root mean square and variance of the received time-domain signals and their discrete wavelet decompositions were computed for the dominant modes propagating through the various bond regions in two different inspection configurations. Semi-analytical finite element analysis of the bonded multilayer joint was also carried out to identify and predict the sensitivity of the predominant carrier modes to the different bond defects. Emphasis of this research is based upon designing a built-in system for monitoring the structural integrity of bonded joints in UAVs and other aerospace structures.

Paper Details

Date Published: 17 May 2005
PDF: 11 pages
Proc. SPIE 5765, Smart Structures and Materials 2005: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, (17 May 2005); doi: 10.1117/12.599061
Show Author Affiliations
Howard Matt, Univ. of California/San Diego (United States)
Ivan Bartoli, Univ. of California/San Diego (United States)
Francesco Lanza di Scalea, Univ. of California/San Diego (United States)
Alessandro Marzani, Univ. della Calabria (Italy)
Stefano Coccia, Univ. of California/San Diego (United States)
Joseph Oliver, Univ. of California/San Diego (United States)
John Kosmatka, Univ. of California/San Diego (United States)
Piervincenzo Rizzo, Univ. of California/San Diego (United States)
Gaetano Restivo, Univ. of California/San Diego (United States)


Published in SPIE Proceedings Vol. 5765:
Smart Structures and Materials 2005: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
Masayoshi Tomizuka, Editor(s)

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