Gardner-like crossover from variable to persistent force contacts in granular crystals
Gardner-like crossover from variable to persistent force contacts in granular crystals
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DOI：
10.1103/physreve.106.054901
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发表时间：
2022-11-15
影响因子：
2.4
通讯作者：
Daniels, Karen E.
中科院分区：
文献类型：
--
作者：
Kool, Lars;Charbonneau, Patrick;Daniels, Karen E.
我们报告的实验证据加德纳交叉从变量到持久的力接触在一个二维的双分散颗粒晶体通过分析单轴压缩下形成的颗粒位置和力网络的变化。从密度刚刚高于冻结过渡和变量的额外压缩，我们比较配置，以自己的初始状态和合奏的等效重新初始化状态。该协议表明，当密度低于Gardner样交叉时，力接触在很大程度上是不确定的，之后它们逐渐过渡到持续的，完全如此，只有在干扰点以上。我们关联的障碍，这种影响的基础与所使用的光弹性磁盘的微观粗糙的大小，类比到其他机制，以前已经在理论上预测。
We report experimental evidence of a Gardner-like crossover from variable to persistent force contacts in a two-dimensional bidisperse granular crystal by analyzing the variability of both particle positions and force networks formed under uniaxial compression. Starting from densities just above the freezing transition and for variable amounts of additional compression, we compare configurations to both their own initial state and to an ensemble of equivalent reinitialized states. This protocol shows that force contacts are largely undetermined when the density is below a Gardner-like crossover, after which they gradually transition to being persistent, being fully so only above the jamming point. We associate the disorder that underlies this effect with the size of the microscopic asperities of the photoelastic disks used, by analogy to other mechanisms that have been previously predicted theoretically.