疲労損傷中の純銅における非線形超音波特性の変化：EMATによる非線形超音波スペクトロスコピー

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  • Evolution of Non-linear Ultrasound Characterization in Pure Copper during the Fatigue Process: Non-linear Resonant Ultrasound Spectroscopy with Electromagnetic Acoustic Transducers
  • ヒロウ ソンショウ チュウ ノ ジュンドウ ニ オケル ヒセンケイ チョウオンパ トクセイ ノ ヘンカ : EMAT ニ ヨル ヒセンケイ チョウオンパ スペクトロスコピー

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説明

In this study, we apply non-contacting nonlinear resonant ultrasound spectroscopy (NNRUS) to the evaluation of fatigue damage in pure copper. NNRUS is a combination of a contactless transducer, electromagnetic acoustic transducer (EMAT), and nonlinear resonant ultrasound spectroscopy (NRUS). The NRUS technique is exploits the significant nonlinear behavior of damaged materials. The resonant frequency of an object is studied as a function of its excitation level. As the excitation level increases, the elastic nonlinearity is manifested by a shift in the resonance frequency. The change in nonlinearity rapidly increases from 80% of fatigue life and is synchronized with the change in the attenuation coefficient with fatigue progression. This novel phenomenon is interpreted in terms of change in dislocation mobility and the dislocation rearrangement. TEM (Transmission Electron Microscope) observations supported this view. This technique has the potential to assess the level of damage and to predict the fatigue life of metals.

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  • 非破壊検査

    非破壊検査 64 (4), 179-183, 2015

    一般社団法人 日本非破壊検査協会

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