Noncontact Evaluation of Surface-Wave Nonlinearity for Creep Damage in Cr–Mo–V Steel
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概要
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A nonlinear acoustic measurement is studied for creep damage evaluation. An electromagnetic acoustic transducer (EMAT) magnetostrictively couples to a surface-shear-wave resonance along the circumference of a cylindrical specimen during the creep of Cr–Mo–V steels. The excitation of the EMAT at half of the resonance frequency caused a standing wave to contain only the second-harmonic component, which was received by the same EMAT for determining the second-harmonic amplitude. This measured surface-wave nonlinearity showed a peak at 30% and a minimum at 50% of the total life. We interpreted these phenomena in terms of dislocation mobility and restructuring, with support from scanning electron microscope (SEM) and transmission electron microscope (TEM) observations. This noncontact resonance-EMAT measurement can monitor the evolution of surface-shear-wave nonlinearity throughout creep life and has a potential to assess damage advance and predict the creep life of metals.
- 2009-07-25
著者
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Ogi Hirotsugu
Graduate School Of Engineering Science Osaka University
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Hirao Masahiko
Graduate School Of Engineering Sci. Osaka Univ.
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Ohtani Toshihiro
Department of Mechanical Systems Engineering, Shonan Institute of Technology, Fujisawa, Kanagawa 251-8511, Japan
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Hirao Masahiko
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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