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Proceedings Paper

Acousto-elastic measurements and baseline-free assessment of bolted joints using guided waves in space structures
Author(s): Andrei Zagrai; Vlasi Gigineishvili; Walter A. Kruse; Andrew Murray; Derek Doyle; Whitney Reynolds; Brandon Arritt; Hugh Gardenier
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Paper Abstract

Integrity of bolted joints is critical for successful deployment and operation of space structures. Conventional structural qualification tests span weeks if not months and inhibit rapid launch of space systems. Recent developments in the embedded ultrasonic acousto-elastic method offer fast diagnosis of bolted joints and opportunities for locating the fault. However, in current acousto-elastic measurement procedures, a baseline representing the healthy condition of the joint is necessary. To mitigate a requirement of the baseline, a new methodology based on relative amplitude and phase measurements is developed. The approach has been validated on laboratory specimens, and modifications were suggested for applications in realistic structures. The paper discusses principles of the baseline-free acoustoelastic method, its practical realization, and respective advantages and disadvantages. Comparison of baseline and baseline-free approaches is presented showing the utility of the recently proposed methodology. Fundamentals of the acousto-elastic response were studied in experiments involving guided wave propagation in a thin plate under tension. The results indicate a difference between acousto-elastic responses collected using sensors oriented parallel and perpendicular to the applied stress. It is suggested that this effect may be used to infer stress orientation in the sample. Practical issues related to acousto-elastic measurements in realistic complex structures are discussed, damage diagnosis algorithms are presented, and potential extensions of the acousto-elastic technique are proposed.

Paper Details

Date Published: 9 April 2010
PDF: 12 pages
Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 765017 (9 April 2010); doi: 10.1117/12.847883
Show Author Affiliations
Andrei Zagrai, New Mexico Institute of Mining and Technology (United States)
Vlasi Gigineishvili, New Mexico Institute of Mining and Technology (United States)
Walter A. Kruse, New Mexico Institute of Mining and Technology (United States)
Andrew Murray, New Mexico Institute of Mining and Technology (United States)
Derek Doyle, Air Force Research Lab. (United States)
Whitney Reynolds, Air Force Research Lab. (United States)
Brandon Arritt, Air Force Research Lab. (United States)
Hugh Gardenier, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 7650:
Health Monitoring of Structural and Biological Systems 2010
Tribikram Kundu, Editor(s)

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