Noncontact monitoring of surface-wave nonlinearity for predicting the remaining life of fatigued steels

Ogi, Hirotsugu; Hirao, Masahiko; Aoki, Shinji

Journal of Applied Physics, 2001, 90(1), 438-442

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Identifier to cite or link to this item: https://hdl.handle.net/11094/84213

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Title
Noncontact monitoring of surface-wave nonlinearity for predicting the remaining life of fatigued steels
Creator
NRID
1000090252626 1000090252626
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Scopus Author ID
35563683500 35563683500
CreatorName
Ogi, Hirotsugu
NRID
1000080112027 1000080112027
CreatorName
Hirao, Masahiko
CreatorName
Aoki, Shinji
Description
Ogi H., Hirao M., Aoki S. "Noncontact monitoring of surface-wave nonlinearity for predicting the remaining life of fatigued steels", Journal of Applied Physics, 90(1), 438-442 (2001) https://doi.org/10.1063/1.1376668.
Abstract
A nonlinear acoustic measurement is studied for fatigue damage monitoring. An electromagnetic acoustic transducer (EMAT) magnetostrictively couples to a surface-shear-wave resonance along the circumference of a rod specimen during rotating bending fatigue of carbon steels. Excitation of the EMAT at half of the resonance frequency caused the standing wave to contain only the second-harmonic component, which was received by the same EMAT to determine the second-harmonic amplitude. Thus measured surface-wave nonlinearity always showed two distinct peaks at 60% and 85% of the total life. We attribute the earlier peak to crack nucleation and growth, and the later peak to an increase of free dislocations associated with crack extension in the final stage. This noncontact resonance-EMAT measurement can monitor the evolution of the surface-shear-wave nonlinearity throughout the metal's fatigue life and detect the pertinent precursors of the eventual failure. © 2001 American Institute of Physics.
Publisher
American Institute of Physics
Source Title
Journal of Applied Physics
Volume (Issue)
90(1)
Page
438-442
Date of Issued
2001-07-19
Language
English
Handle URL
https://hdl.handle.net/11094/84213
PISSN
00218979
eISSN
10897550
NCID
AA00693547
AA11868165
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1063/1.1376668
Access Rights
open access
CopyRight
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics, 90(1), 438-442 (2001) and may be found at https://doi.org/10.1063/1.1376668.
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学術雑誌論文 Journal Article