Babu Varghese, Vinutha H A, Bi Dapeng, Sastry Srikanth
Theoretical Sciences Unit and School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Rachenahalli Lake Road, Bengaluru 560064, India.
Department of Physics, Institute for Soft Matter Synthesis and Metrology, Georgetown University, Washington, DC, USA.
Soft Matter. 2023 Dec 13;19(48):9399-9404. doi: 10.1039/d3sm00725a.
We investigate the rigidity transition associated with shear jamming in frictionless, as well as frictional, disk packings in the quasi-static regime and at low shear rates. For frictionless disks, the transition under quasi-static shear is discontinuous, with an instantaneous emergence of a system spanning rigid clusters at the jamming transition. For frictional systems, the transition appears continuous for finite shear rates, but becomes sharper for lower shear rates. In the quasi-static limit, it is discontinuous as in the frictionless case. Thus, our results show that the rigidity transition associated with shear jamming is discontinuous, as demonstrated in the past for isotropic jamming of frictionless particles, and therefore a unifying feature of the jamming transition in general.
我们研究了在准静态状态和低剪切速率下，无摩擦以及有摩擦的圆盘堆积中与剪切堵塞相关的刚性转变。对于无摩擦圆盘，准静态剪切下的转变是不连续的，在堵塞转变时会瞬间出现跨越整个系统的刚性团簇。对于有摩擦的系统，在有限剪切速率下转变似乎是连续的，但在较低剪切速率下会变得更尖锐。在准静态极限下，它与无摩擦情况一样是不连续的。因此，我们的结果表明，与剪切堵塞相关的刚性转变是不连续的，正如过去对无摩擦颗粒的各向同性堵塞所证明的那样，因此一般来说是堵塞转变的一个统一特征。
