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Title: Orienting fatigue cracks using contact acoustic nonlinearity in scattered plate waves
Authors: Wang, K 
Fan, Z
Su, Z 
Issue Date: Sep-2018
Source: Smart materials and structures, Sept. 2018, v. 27, no. 9, 09LT01
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.
Keywords: Crack orientation
Nonlinear scatterer
Contact acoustic nonlinearity
'Breathing' fatigue crack
Publisher: Institute of Physics Publishing
Journal: Smart materials and structures 
ISSN: 0964-1726
EISSN: 1361-665X
DOI: 10.1088/1361-665X/aad52f
Rights: © 2018 IOP Publishing Ltd
This manuscript version is made available under theCC-BY-NC-ND 4.0 (license
The following publication 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 is available at
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