Fatigue crack localization with near-field acoustic emission signals

Changjiang Zhou; Yunfeng Zhang

doi:10.1117/12.2009507

19 April 2013 Fatigue crack localization with near-field acoustic emission signals

Changjiang Zhou, Yunfeng Zhang

Proceedings Volume 8692, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2013; 86920L (2013) https://doi.org/10.1117/12.2009507
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2013, San Diego, California, United States

Abstract

This paper presents an AE source localization technique using near-field acoustic emission (AE) signals induced by crack growth and propagation. The proposed AE source localization technique is based on the phase difference in the AE signals measured by two identical AE sensing elements spaced apart at a pre-specified distance. This phase difference results in canceling-out of certain frequency contents of signals, which can be related to AE source direction. Experimental data from simulated AE source such as pencil breaks was used along with analytical results from moment tensor analysis. It is observed that the theoretical predictions, numerical simulations and the experimental test results are in good agreement. Real data from field monitoring of an existing fatigue crack on a bridge was also used to test this system. Results show that the proposed method is fairly effective in determining the AE source direction in thick plates commonly encountered in civil engineering structures.

Citation Download Citation

Changjiang Zhou and Yunfeng Zhang "Fatigue crack localization with near-field acoustic emission signals", Proc. SPIE 8692, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2013, 86920L (19 April 2013); https://doi.org/10.1117/12.2009507

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