Abstract

In this paper, we investigated transducer placement strategies for detecting cracks in primary aircraft structures using ultrasonic Structural Health Monitoring (SHM). The approach developed is for an expected damage location based on fracture mechanics, for example fatigue crack growth in a high stress location. To assess the performance of the developed approach, finite-element (FE) modelling of a damage-tolerant aluminum fuselage has been performed by introducing an artificial crack at a rivet hole into the structural FE model and assessing its influence on the Lamb wave propagation, compared to a baseline measurement simulation. The efficient practical sensor position was determined from the largest change in area that is covered by reflected and missing wave scatter using an additive color model. Blob detection algorithms were employed to determine the boundaries of this area and to calculate the blob centroid. To demonstrate that the technique can be generalized, the results from different crack lengths and from tilted crack are also presented.

Details

Title
Transducer Placement Option of Lamb Wave SHM System for Hotspot Damage Monitoring
Author
Ewald, Vincentius 1 ; Groves, Roger M 1   VIAFID ORCID Logo  ; Benedictus, Rinze 2 

1  Aerospace Non-Destructive Testing Laboratory, Faculty of Aerospace Engineering, Delft University of Technology, 2628 CD Delft, The Netherlands 
2  Chair of Structural Integrity and Composites, Faculty of Aerospace Engineering, Delft University of Technology, 2628 CD Delft, The Netherlands 
First page
39
Publication year
2018
Publication date
2018
Publisher
MDPI AG
e-ISSN
22264310
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.3390/aerospace5020039
ProQuest document ID
2582791770
Copyright
© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.