论文标题
从变量到颗粒晶体中的持续力接触的园艺样过渡
Gardner-like transition from variable to persistent force contacts in granular crystals
论文作者
论文摘要
我们报告了通过分析在单轴压缩下形成的两个粒子位置和力网络的变异性，报告了从变量到持续力接触的园艺样过渡到持续的力接触的实验证据。从冻结过渡上方的密度开始，对于可变数量的额外压缩，我们将配置与它们自己的初始状态以及等效的，重新定义的状态的集合进行了比较。该协议表明，当密度在类似Gardner的过渡以下时，力接触在很大程度上是不确定的，此后它们逐渐过渡到持久，完全仅高于干扰点。我们将这种作用构成的疾病与所使用光弹性磁盘的微观悬垂性的大小相关联，该疾病与以前在理论上预测的其他机制相似。
We report experimental evidence of a Gardner-like transition 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 transition, after which they gradually transition to being persistent, being fully so only above the jamming point. We associate the disorder that underlies this effect to the size of the microscopic asperities of the photoelastic disks used, by analogy to other mechanisms that have been previously predicted theoretically.
