Fingering instability during fracture of a gel block subjected to shear loading.,Physical Review E

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Fingering instability during fracture of a gel block subjected to shear loading.
Physical Review E ( IF 2.2 ) Pub Date : 2020-07-01 , DOI: 10.1103/physreve.102.013002
Krishna Kant Kundan ₁ , Animangsu Ghatak _{1,

2}

Affiliation

We report here an alternative kind of fingering instability observed during fracture of an unconfined gel consisting of two cuboids joined by a thin gel disk, and all prepared monolithically. When the blocks are sheared across the joint, fracture ensues with the appearance of fingers at the fracture front. The spacing between the fingers remains independent of the shearing speed, planar shape of the joint, and the shear modulus of gel. Importantly this instability appears without any effect of confinement of the gel block, and its wavelength remains dependent on the lateral size of the disk, in contrast to all known instances of fingering phenomena in confined viscous, elastic, and viscoelastic systems.

中文翻译：

凝胶块在剪切载荷作用下断裂过程中的指法不稳定性。

我们在这里报告了另一种指法不稳定性，它是在无约束的凝胶破裂过程中观察到的，该凝胶由两个通过薄凝胶盘连接的长方体组成，并且都是整体制备的。当块在关节上剪断时，接着出现骨折，手指在骨折前出现。手指之间的间距保持与剪切速度，接头的平面形状以及凝胶的剪切模量无关。重要的是，与所有已知的受限粘性，弹性和粘弹性系统中指法现象的实例相反，这种不稳定性在不受凝胶块限制的任何影响的情况下出现，并且其波长仍然取决于盘的横向尺寸。

更新日期：2020-07-01

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