Growth of gas-filled penny-shaped cracks in decompressed hydrogels

被引：1
|
作者：
Zhang, Yansheng [1 ]
Etzold, Merlin A. [1 ]
Lefauve, Adrien [1 ]
机构：
[1] Univ Cambridge, Dept Appl Math & Theoret Phys, Wilberforce Rd, Cambridge CB3 0WA, England
来源：
SOFT MATTER | 2021年 / 17卷 / 04期
关键词：
We thank Mr Zhiyuan Wei for discussions about the modelling. This research was conducted while Y. Z. was an undergraduate student at Trinity College; Cambridge; supported by a Trinity Overseas Bursary. A. L. was supported by an Early Career Fellowship funded by the Leverhulme Trust and Isaac Newton Trust;
D O I：
10.1039/d0sm01795g
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report that the decompression of soft brittle materials can lead to the growth of internal gas-filled cracks. These cracks are oblate spheroids ('penny shape'), whose major radius grows linearly in time, irreversibly fracturing the surrounding material. Our optical measurements in hydrogels characterise and quantify the three-dimensional crack geometry and growth rate. These results are in good agreement with our analytical model coupling fracture mechanics and gas diffusion, and predicting the dependence on the mechanical properties, gas diffusivity and super-saturation conditions (gas pressure, solubility, temperature). Our results suggest a new potential mechanism for decompression sickness in scuba diving and for indirect optical measurements of the fracture properties of hydrogels.
引用
收藏
页码：815 / 825
页数：12
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