Shear-wave generation from cavitation in soft solids

Abstract

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.

References in corpus (2)

• Imaging of Shear Waves Induced by Lorentz Force in Soft Tissues
• Generation of Shear Waves by Laser in Soft Media in the Ablative and Thermoelastic Regimes

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• Pressure fluctuations of liquids under short-time acceleration
• High-speed ultrasound imaging of bubbly flows and shear waves in soft matter
• Analytical solution for a vibrating rigid sphere with an elastic shell in an infinite linear elastic medium