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arXiv 1902.02167cond-mat.softphysics.flu-dyn
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软固体中由空化产生的剪切波

Shear-wave generation from cavitation in soft solids

Julien Rapet, Yoshiyuki Tagawa, Claus-Dieter Ohl

摘要:

液体中空穴的形成和动力学过程导致空穴坍缩过程中动能的聚焦和纵向应力波的发射。在这里,我们报告说,弹性固体中的空化可能会额外发出剪切波,可能会影响人体/大脑中的软组织。在靠近气固边界的空腔塌陷期间,空腔远离边界移动并形成定向射流,其将剪切应力限制在气泡和自由边界之间的体积中。弹性成像和高速成像解决了这一过程,并揭示了该区域剪切波的起源。此外,明胶表面变形和锥形裂纹的发展。我们推测,在药物治疗中观察到的组织断裂可能与非球形空化泡塌陷有关。

英文摘要:

The formation and dynamics of cavities in liquids leads to focusing of kinetic energy and emission of longitudinal stress waves during the cavity collapse. Here we report that cavitation in elastic solids may additionally emit shear waves that could affect soft tissues in human bodies/brains. During collapse of the cavity close to an air-solid boundary, the cavity moves away from the boundary and forms a directed jet flow, which confines shear stresses in a volume between the bubble and the free boundary. Elastographic and high-speed imaging resolve this process and reveal the origin of a shear wave in this region. Additionally, the gelatin surface deforms and a conical crack evolves. We speculate that tissue fracture observed in medical therapy may be linked to the non-spherical cavitation bubble collapse.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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