Imperial College London
Alternate

DrFredericCegla

Faculty of Engineering, Department of Mechanical Engineering

Reader in Mechanical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 8096f.cegla

 
 
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Location

 

567City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Parra-Raad:2021:10.1016/j.ndteint.2021.102440,
author = {Parra-Raad, J and Lan, B and Cegla, F},
doi = {10.1016/j.ndteint.2021.102440},
journal = {Independent Nondestructive Testing and Evaluation (NDT and E) International},
title = {Orthogonally polarised shear waves for evaluating anisotropy and cracks in metals},
url = {http://dx.doi.org/10.1016/j.ndteint.2021.102440},
volume = {121},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The detection of crack-like defects using ultrasound is a problem widely studied by the non-destructive evaluation community. In this work, a technique of how to detect the presence of a crack-like defect and estimate its orientation in an anisotropic material by means of two orthogonal shear waves is presented. A detailed study of shear wave propagating and splitting at any incident angle, and its interaction with crack-like defects in anisotropic materials, is also presented. In this paper it is shown that by the use of two orthogonal shear waves with linear polarisation the authors could: 1) estimate the material level of anisotropy within approximately 0.5% of the measured value; 2) estimate the angular position of the principal shear directions of the material with respect to the orthogonal shear wave sources within ±5 accuracy; 3) excite a shear wave purely polarised along one of the principal shear directions with two orthogonal shear waves placed at an arbitrary angular position; 4) detect the presence of a crack-like defect in an anisotropic material based on the back-wall echoes of two orthogonal shear waves, 5) estimate the orientation of a crack-like defect in an anisotropic material within ∼ ± 5 of the theoretical value. The simulation and experimental results obtained show that the technique presented in this paper has potential to become an effective tool for crack-like defect detection and material characterisation.
AU  - Parra-Raad,J
AU  - Lan,B
AU  - Cegla,F
DO  - 10.1016/j.ndteint.2021.102440
PY  - 2021///
SN  - 0963-8695
TI  - Orthogonally polarised shear waves for evaluating anisotropy and cracks in metals
T2  - Independent Nondestructive Testing and Evaluation (NDT and E) International
UR  - http://dx.doi.org/10.1016/j.ndteint.2021.102440
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000659472400003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/103648
VL  - 121
ER  -
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