Fractal Dimension Analysis for Robust Ultrasonic Non-Destructive Evaluation (NDE) of Coarse Grained Materials

Li, M. and Hayward, G. (2018) Fractal Dimension Analysis for Robust Ultrasonic Non-Destructive Evaluation (NDE) of Coarse Grained Materials. In: 44th Annual Review of Progress in Quantitative Nondestructive Evaluation, Provo, UT, USA, 16-21 July 2017, 150003-1-150003-7. ISBN 9780735416444 (doi:10.1063/1.5031618)

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Abstract

Over the recent decades, there has been a growing demand on reliable and robust non-destructive evaluation (NDE) of structures and components made from coarse grained materials such as alloys, stainless steels, carbon-reinforced composites and concrete; however, when inspected using ultrasound, the flaw echoes are usually contaminated by high-level, time-invariant, and correlated grain noise originating from the microstructure and grain boundaries, leading to pretty low signal-to-noise ratio (SNR) and the flaw information being obscured or completely hidden by the grain noise. In this paper, the fractal dimension analysis of the A-scan echoes is investigated as a measure of complexity of the time series to distinguish the echoes originating from the real defects and the grain noise, and then the normalized fractal dimension coefficients are applied to the amplitudes as the weighting factor to enhance the SNR and defect detection. Experiments on industrial samples of the mild steel and the stainless steel are conducted and the results confirm the great benefits of the method.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Li, Dr David
Authors: Li, M., and Hayward, G.
College/School:College of Science and Engineering > School of Engineering
ISSN:0094-243X
ISBN:9780735416444
Copyright Holders:Copyright © 2018 AIP Publishing
First Published:First published in 44th Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 37 AIP Conf. Proc. 1949, 150003-1–150003-7
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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