Crack identification in hollow section structures through coupled response measurements

Liu, D., Gurgenci, H. and Veidt, M. (2001). Crack identification in hollow section structures through coupled response measurements. In: Proceedings of SPIE: The International Modal Analysis Conference - IMAC. 19th International Modal Analysis Conference, Kissimmee, Florida, (199-206). 5-8 Feb 2001.

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Author Liu, D.
Gurgenci, H.
Veidt, M.
Title of paper Crack identification in hollow section structures through coupled response measurements
Conference name 19th International Modal Analysis Conference
Conference location Kissimmee, Florida
Conference dates 5-8 Feb 2001
Proceedings title Proceedings of SPIE: The International Modal Analysis Conference - IMAC   Check publisher's open access policy
Journal name Proceedings of Imac-Xix: a Conference On Structural Dynamics, Vols 1 and 2   Check publisher's open access policy
Place of Publication Bethel, Conn
Publisher Society for Experimental Mechanics Inc.
Publication Year 2001
Sub-type Fully published paper
Open Access Status File (Publisher version)
ISBN 0912053720
ISSN 1046-6770
Volume 4359
Start page 199
End page 206
Total pages 8
Language eng
Abstract/Summary This paper present a feasible method for crack identification in hollow section structures based on the coupling vibration behaviour of cracked members. From the last several decades lots of techniques have been developed by many researchers to detect, locate and quantify damage by using changes to modal parameters such as natural frequency, mode shape or damping ratio. However, these approaches suffer from the fact that the structural damage has a low sensitivity to changes in these parameters. A related option is offered through coupled response measurements. A transverse surface crack is well known to produce local flexibility due to the stress-strain singularity in the vicinity of the crack tip. The local flexibility can be represented by the way of a 6x6 matrix for a beam element that includes the crack. This matrix contains off-diagonal terms that cause coupling response along the direction corresponding to these terms. This coupling property due to the crack is evidence of the existence of the cracks. Coupled response of cracked hollow section structures was studied. Hollow section structures demonstrate a more pronounced coupling when cracks occur. In this paper, both an analytical simulation and the early results of experimental implementation are presented. This method is fairly discriminative even for small cracks.
Subjects 0913 Mechanical Engineering
Keyword Computer simulation
Dynamic response
Elastic moduli
Failure analysis
Matrix algebra
Modal analysis
Natural frequencies
Stress analysis
Vibrations (mechanical)
Crack identification
Strain energy density function
Structural analysis
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Collection: School of Mechanical & Mining Engineering Publications
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Created: Wed, 19 Apr 2006, 00:51:19 EST