Title
An on-line combined linear-nonlinear fatigue crack detection techniqueAn on-line combined linear-nonlinear fatigue crack detection technique
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
article
Publication
London,
Subject
Engineering sciences. Technology
Source (journal)
NDT and E international: the independant non-destructive testing and evaluation. - London
Volume/pages
37(2004):1, p. 41-45
ISSN
0963-8695
ISI
000187880700006
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
To monitor the structural health during fatigue tests, classical nondestructive tests (ultrasonic inspection, liquid penetration, eddy current, etc.) are usually performed at regular time instances. Unfortunately, the fatigue tests should be interrupted to use these techniques. In addition, a large amount of user interaction is required. In this article, vibration features are used to detect cracks on-line with the execution of a fatigue test. To perform this task, an experimental strategy is developed to simultaneously estimate static and dynamic as well as linear and nonlinear vibration features. By means of these features the sensitivity of static versus dynamic and linear versus nonlinear damage detection techniques will be qualified. Finally, it will be shown that by using nonlinear identification techniques, additional information on the damage scenario can be extracted. The validation will be done on a steel beam with a propagating fatigue crack. (C) 2004 Elsevier Ltd. All rights reserved.
E-info
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