Biomechanics and Bioengineering Laboratory (UMR 7338) CNRS, Sorbonne Universités, Université de Technologie de Compiègne, 60200 Compiègne, France.
Soft Matter. 2017 Oct 25;13(41):7644-7648. doi: 10.1039/c7sm01417a.
We study experimentally the deformation and break-up of liquid-filled capsules trapped at an axisymmetric step constriction, and subjected to increasing pressure drops. We considered biological (trout fish eggs) and bioartificial (made of ovalbumin and alginate) ones, with the objective to characterize the transition to break-up. We find that both capsule populations behave as a brittle material. They do not exhibit any plastic deformation prior to break-up. Moreover critical pressure drop exhibits a stochastic behavior as known for the fracture of disordered media. The break-up probability follows a three-parameter Weibull distribution, from which one can deduce the capsule rupture characteristics.
我们通过实验研究了在轴对称阶跃收缩处捕获并承受压力降逐渐增大的充液胶囊的变形和破裂。我们考虑了生物（鳟鱼卵）和生物人工（卵清蛋白和藻酸盐制成）胶囊，旨在表征向破裂的转变。我们发现，这两种胶囊都表现出脆性材料的特征。在破裂之前，它们没有发生任何塑性变形。此外，临界压降表现出类似于无序介质断裂的随机行为。破裂概率遵循三参数 Weibull 分布，从中可以推断出胶囊的破裂特性。
