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Title: Characterising fatigue crack in an aluminium plate using guided elastic waves
Authors: Zhou, C
Su, Z 
Cheng, L 
Keywords: Acousto-ultrasonic waves
Fatigue crack
Nonlinear wave characteristics
Structural health monitoring
Issue Date: 2011
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2011, v. 7981, 798134 How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
Abstract: Integrity of in-service engineering structures is prone to fatigue damage over their lifespan. Majority of the currently existing elastic-wave-based damage identification techniques have been developed and validated for damage at macroscopic levels, by canvassing linear properties of elastic waves such as attenuation, transmission, reflection and mode conversion. However the real damage in engineering structures often initiates from fatigue crack, presenting highly nonlinear characteristics under cyclic loads. It is of great significance but vast challenge to detect fatigue damage of small dimension at its initial stage. In this study, traditional elastic-wave-based damage identification techniques were first employed with an attempt to detect fatigue crack initiated from a notch in an aluminium plate with the assistance of a signal correlation analysis, to observe the deficiency of the approach. Then the higher-order harmonic wave generation was used to exploit the nonlinear characteristics of acousto-ultrasonic waves (Lamb waves), whereby the fatigue damage was characterised. Results show that nonlinear characteristics of acousto-ultrasonic waves can facilitate more effective detection of fatigue damage than linear signal features such as wave reflection, transmission or mode conversion.
Description: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, San Diego, CA, 7-10 March 2011
ISBN: 9780819485434
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.879894
Appears in Collections:Conference Paper

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