A mechanism for damage spread by ultrasound-induced linear defects in soft materials
Abstract
High-intensity ultrasound excites pre-existing bubbles in tissue-like material, and the subsequent bubble activity may lead to damage. To investigate such damage mechanisms, agar tissue-mimicking phantoms were subjected to multiple pressure wave bursts of the kind being considered specifically for burst wave lithotripsy (BWL). A notable feature of these experiments was the formation of distinct linear defects, as might expected for a crack. We propose a physical mechanism for how a single bubble, excited by ultrasound, may evolve to from such features. It entails fracture, bubble stability and rectified mass diffusion. These observed linear defects are a potential mechanism for spread of ultrasound-induced bubbles and the subsequent damage.
Keywords
Cite
@article{arxiv.1811.03915,
title = {A mechanism for damage spread by ultrasound-induced linear defects in soft materials},
author = {Pooya Movahed and Jonathan B. Freund},
journal= {arXiv preprint arXiv:1811.03915},
year = {2018}
}