日本語フィールド
著者：住隆博，橋本時忠 読み: スミタカヒロ，ハシモトトキタダ題名：慣性マイクロキャビテーションの逆解析による粘弾性物質の動的特性の推定発表情報：日本レオロジー学会誌 巻: 50 号: 1 ページ: 137-145キーワード：概要：抄録：From a medical engineering point of view, dynamic properties of viscoelastic materials in high strain rate region (> 103 s −1) are considerably important for understanding influences of recent minimally invasive surgical techniques with lasers, ultrasounds, and shock waves on biological tissues. In this article, a new rheological method via inverse analysis on laser-induced inertial micro cavitation phenomena in the viscoelastic materials is constructed to overcome limits of conventional macroscopic / microscopic rheometries in the high strain rate region. In the following, a visualization system enabling high-speed imaging of the cavitation phenomena induced by a high-energy pulsed laser is arranged, and equations of motion with specific viscoelastic constitutive laws are formulated to describe the corresponding cavitation dynamics. Furthermore, a suitable objective function for the inverse analysis is designed and numerical optimization procedures are proposed. Polyvinyl alcohol hydrogels (PVA-H) with different mass concentrations, which are well known as simulated biological tissues, are employed as test materials. As a result, it is confirmed that the present cavitation phenomena are well located in the high strain rate region, and that the dynamic properties are possible to be estimated in the PVA-H samples within moderate deviation ranges.英語フィールド
Author：Takahiro SUMI, Tokitada HASHIMOTOTitle：Announcement information: Vol: 50 Issue: 1 Page: 137-145An abstract：From a medical engineering point of view, dynamic properties of viscoelastic materials in high strain rate region (> 103 s −1) are considerably important for understanding influences of recent minimally invasive surgical techniques with lasers, ultrasounds, and shock waves on biological tissues. In this article, a new rheological method via inverse analysis on laser-induced inertial micro cavitation phenomena in the viscoelastic materials is constructed to overcome limits of conventional macroscopic / microscopic rheometries in the high strain rate region. In the following, a visualization system enabling high-speed imaging of the cavitation phenomena induced by a high-energy pulsed laser is arranged, and equations of motion with specific viscoelastic constitutive laws are formulated to describe the corresponding cavitation dynamics. Furthermore, a suitable objective function for the inverse analysis is designed and numerical optimization procedures are proposed. Polyvinyl alcohol hydrogels (PVA-H) with different mass concentrations, which are well known as simulated biological tissues, are employed as test materials. As a result, it is confirmed that the present cavitation phenomena are well located in the high strain rate region, and that the dynamic properties are possible to be estimated in the PVA-H samples within moderate deviation ranges.