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

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  • An Estimation of Dynamic Properties of Viscoelastic Materials via Inverse Analysis on Inertial Micro Cavitation
  • カンセイ マイクロキャビテーション ノ ギャクカイセキ ニ ヨル ネンダンセイ ブッシツ ノ ドウテキ トクセイ ノ スイテイ

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<p>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.</p>

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