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Title: Orienting fatigue cracks using contact acoustic nonlinearity in scattered plate waves
Authors: Wang, Kai
Fan, Zheng
Su, Zhongqing
Keywords: Engineering::Mechanical engineering
Issue Date: 2018
Source: Wang, K., Fan, Z., & Su, Z. (2018). Orienting fatigue cracks using contact acoustic nonlinearity in scattered plate waves. Smart Materials and Structures, 27(9), 09LT01-. doi:10.1088/1361-665x/aad52f
Journal: Smart Materials and Structures
Abstract: Targeting quantitative delineation of nonlinear scatterers in elastic media and undersized fatigue cracks in particular, the present study is dedicated to investigation, from analytical, numerical, and experimental perspectives, of the underlying mechanism of interaction between guided ultrasonic waves (GUWs) and 'breathing' fatigue cracks - a representative nonlinear scatterer type. Under the modulation of probing GUWs, a 'breathing' crack scatters GUWs, in which the crack-triggered contact acoustic nonlinearity (CAN) is embodied. Analytical modeling demonstrates that the extracted CAN manifests unique scattering patterns associated with the crack slant, on which basis the crack can be oriented, without requiring reference to baseline signals. Experimental validation corroborates analytical prediction, in which an embryonic fatigue crack in an aluminum plate waveguide is oriented accurately and visualized in a pixelated image.
ISSN: 0964-1726
DOI: 10.1088/1361-665X/aad52f
Rights: © 2018 IOP Publishing Ltd. All rights reserved. This is an author-created, un-copyedited version of an article accepted for publication in Smart Materials and Structures. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MAE Journal Articles


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