Characterising fatigue crack in an aluminium plate using guided elastic waves

Chao Zhou; Zhongqing Su; Li Cheng

doi:10.1117/12.879894

14 April 2011 Characterising fatigue crack in an aluminium plate using guided elastic waves

Chao Zhou, Zhongqing Su, Li Cheng

Author Affiliations +

Proceedings Volume 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011; 798134 (2011) https://doi.org/10.1117/12.879894
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

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.

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Chao Zhou, Zhongqing Su, and Li Cheng "Characterising fatigue crack in an aluminium plate using guided elastic waves", Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 798134 (14 April 2011); https://doi.org/10.1117/12.879894

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KEYWORDS

Semiconducting wafers

Aluminum

Ferroelectric materials

Wave plates

Structural engineering

Signal detection

Scattering

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