High-frequency guided waves for defect detection in stiffened plate structures
Due to the beating phenomenon, the Rayleigh-like wave can propagate past regions with surface defects or features. This allows for the remote detection of defects in areas where access is restricted by structural features, such as stiffeners and stringers. By selecting appropriate excitation frequency and position, a significant part of the energy can be transmitted behind the obstacle and reflected at the defect, allowing detection. This has been shown experimentally, where surface slots were detected behind multiple stiffeners by standard pulse-echo measurements. The measured signals were verified from Finite Difference (FD) simulations and the detection sensitivity for different defect locations and depths has been discussed.
Document Type: Research Article
Affiliations: 1 Dr Bernard Masserey is a Professor in the Department of Industrial Technologies at the University of Applied Sciences, Fribourg, Switzerland. He studied Mechanical Engineering and completed his PhD at ETH Zurich, Switzerland. From 2006 to 2007 he worked as a post-doctoral research fellow in the Department of Mechanical Engineering at University College London, England. His main research interests lie in the application of surface waves for structural health monitoring of aircraft structures. bernard.massereyhefr.ch, 429 66 58, Tel: 41 (0)26
Publication date: December 1, 2009
- Official Journal of The British Institute of Non-Destructive Testing - includes original research and devlopment papers, technical and scientific reviews and case studies in the fields of NDT and CM.
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