A Novel Ultrasonic Evaluation Process for Cavitation Damage by Combination of Attenuation and Higher Harmonics
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- Tao WAN
- Graduate School of Science and Engineering, Ibaraki University
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- Takashi WAKUI
- Individual member J-PARC Center, Japan Atomic Energy Agency
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- Takashi NAOE
- Individual member J-PARC Center, Japan Atomic Energy Agency
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- Masatoshi FUTAKAWA
- Individual member J-PARC Center, Japan Atomic Energy Agency
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- Katsuhiro MAEKAWA
- College of Engineering, Ibaraki University
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説明
The mercury target system is used for MW-scale neutron sources in the Japan Spallation Neutron Source. During this operation, cavitation damage is imposed on the mercury target vessel. It is very important to nondestructively evaluate the cavitation damage from the viewpoints of the structural integrity evaluation and lifetime estimation of the mercury target vessel. In this study, the cavitation damage was evaluated using a nonlinear ultrasonic method. First, the cavitation damage was imposed on plate specimens using an electro-Magnetic IMpact Testing Machine with 108 impact cycles. Nonlinear ultrasonic imaging was used to evaluate the damage. We found that the damping factor and higher harmonics of reflected waveforms from the damaged area can be used to evaluate the damage. An effective cavitation damage evaluation process has been developed based on our results. The evaluation process successfully detected minimal cavitation damage with peak-to-peak roughness of about 25 μm.
収録刊行物
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- 実験力学
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実験力学 13 (4), 387-394, 2013
日本実験力学会
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詳細情報 詳細情報について
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- CRID
- 1390282680167180288
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- NII論文ID
- 130004489839
- 40019937781
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- NII書誌ID
- AA11822914
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- ISSN
- 18844219
- 13464930
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- NDL書誌ID
- 025134994
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDLサーチ
- CiNii Articles
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- 使用不可