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| 講演名 | 2010-01-26 14:25 Determination of the elastic properties of thin layers and graded materials using generalized Love waves ○Piotr Kielczynski・Marek Szalewski（Polish Academy. of Sciences.）  US2009-108 |
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| 抄録 | （和） | The elastic properties of coatings and graded materials are very important in the design and evaluation for engineering purposes. It is well known that the velocity of the ultrasonic surface waves propagating in the layered structures and graded materials is strongly dependent on the elastic properties of the medium. Thus, by using an appropriate inverse algorithm, the elastic properties can be deduced from the measured phase velocity dispersion curves (dependence of velocity on frequency) of the surface wave. In this study we applied generalized shear surface waves (i.e., generalized Love waves) to investigate the elastic parameters of the layered media and graded materials. Generalized Love waves posses only one component of the mechanical displacement what is an advantage. Due to this reason, the mathematical description of the propagation of generalized Love waves is simpler than that using Rayleigh waves. In this article an inversion procedure for determining the elastic and geometrical parameters of thin coating layers from the measured dispersion curves of ultrasonic shear surface waves (i.e., Love waves) is presented. The inverse problem is formulated as an optimization problem with appropriately developed objective function. The objective function depends on the material parameters of the coating layer, frequency, and experimental data (phase velocity of the surface Love wave). The minimization of the objective function leads to a set of the optimum mechanical parameters of the thin layers (e.g., thickness, shear elastic constants). Good conformity between the experimental dispersion curves and those resulting from the inverse method can prove the correctness of the proposed inverse procedure. |
| （英） | The elastic properties of coatings and graded materials are very important in the design and evaluation for engineering purposes. It is well known that the velocity of the ultrasonic surface waves propagating in the layered structures and graded materials is strongly dependent on the elastic properties of the medium. Thus, by using an appropriate inverse algorithm, the elastic properties can be deduced from the measured phase velocity dispersion curves (dependence of velocity on frequency) of the surface wave. In this study we applied generalized shear surface waves (i.e., generalized Love waves) to investigate the elastic parameters of the layered media and graded materials. Generalized Love waves posses only one component of the mechanical displacement what is an advantage. Due to this reason, the mathematical description of the propagation of generalized Love waves is simpler than that using Rayleigh waves. In this article an inversion procedure for determining the elastic and geometrical parameters of thin coating layers from the measured dispersion curves of ultrasonic shear surface waves (i.e., Love waves) is presented. The inverse problem is formulated as an optimization problem with appropriately developed objective function. The objective function depends on the material parameters of the coating layer, frequency, and experimental data (phase velocity of the surface Love wave). The minimization of the objective function leads to a set of the optimum mechanical parameters of the thin layers (e.g., thickness, shear elastic constants). Good conformity between the experimental dispersion curves and those resulting from the inverse method can prove the correctness of the proposed inverse procedure. |
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| キーワード | （和） | inverse problems / Love waves / elastic constants / acoustic wave dispersion / thin layers / graded materials / / |
| （英） | inverse problems / Love waves / elastic constants / acoustic wave dispersion / thin layers / graded materials / / | |
| 文献情報 | 信学技報, vol. 109, no. 388, US2009-108, pp. 117-122, 2010年1月. | |
| 資料番号 | US2009-108 | |
| 発行日 | 2010-01-18 (US) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| 著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します．(許諾番号：10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| PDFダウンロード | US2009-108 |
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| 研究会情報 | |
| 研究会 | EA US |
| 開催期間 | 2010-01-25 - 2010-01-26 |
| 開催地（和） | 関西大 |
| 開催地（英） | |
| テーマ（和） | ＜音響・超音波サブソサイエティ合同研究会＞ テーマ：一般（応用／電気音響・超音波） |
| テーマ（英） | |
| 講演論文情報の詳細 | |
| 申込み研究会 | US |
| 会議コード | 2010-01-EA-US |
| 本文の言語 | 英語 |
| タイトル（和） | |
| サブタイトル（和） | |
| タイトル（英） | Determination of the elastic properties of thin layers and graded materials using generalized Love waves |
| サブタイトル（英） | |
| キーワード(1)（和/英） | inverse problems / inverse problems |
| キーワード(2)（和/英） | Love waves / Love waves |
| キーワード(3)（和/英） | elastic constants / elastic constants |
| キーワード(4)（和/英） | acoustic wave dispersion / acoustic wave dispersion |
| キーワード(5)（和/英） | thin layers / thin layers |
| キーワード(6)（和/英） | graded materials / graded materials |
| キーワード(7)（和/英） | / |
| キーワード(8)（和/英） | / |
| 第1著者 氏名（和/英/ヨミ） | Piotr Kielczynski / Piotr Kielczynski / |
| 第1著者 所属（和/英） | Polish Academy of Sciences (略称： Polish Academy. of Sciences.) Polish Academy of Sciences (略称： Polish Academy. of Sciences.) |
| 第2著者 氏名（和/英/ヨミ） | Marek Szalewski / Marek Szalewski / |
| 第2著者 所属（和/英） | Polish Academy of Sciences (略称： Polish Academy. of Sciences.) Polish Academy of Sciences (略称： Polish Academy. of Sciences.) |
| 講演者 | 第1著者 |
| 発表日時 | 2010-01-26 14:25:00 |
| 発表時間 | 25分 |
| 申込先研究会 | US |
| 資料番号 | US2009-108 |
| 巻番号（vol） | vol.109 |
| 号番号（no） | no.388 |
| ページ範囲 | pp.117-122 |
| ページ数 | 6 |
| 発行日 | 2010-01-18 (US) |
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