论文标题
周期性剪切的无摩擦颗粒中的均匀结晶
Homogeneous crystallization in cyclically sheared frictionless grains
论文作者
论文摘要
过去半个世纪的许多实验表明，对于一系列方案，在压力下紧凑的颗粒状材料和反复的小扰动。循环剪切的球形晶粒的最新实验通过均匀结晶显示出明显的压实（Rietz等，2018）。在这里，我们介绍了在固定垂直载荷下使用耗时型牛顿动力学的无摩擦，纯粹排斥球的数值模拟。我们表明，对于足够小的应变振幅，循环剪切物在体积分数$ ϕ = 0.646 \ pm 0.001 $时产生均匀的结晶。该结果表明，在驱动的颗粒培养基中，摩擦和重力既不是均质结晶必不可少的。
Many experiments over the past half century have shown that, for a range of protocols, granular materials compact under pressure and repeated small disturbances. A recent experiment on cyclically sheared spherical grains showed significant compaction via homogeneous crystallization (Rietz et al., 2018). Here we present numerical simulations of frictionless, purely repulsive spheres undergoing cyclic simple shear with dissipative Newtonian dynamics at fixed vertical load. We show that for sufficiently small strain amplitudes, cyclic shear gives rise to homogeneous crystallization at a volume fraction $ϕ= 0.646 \pm 0.001$. This result indicates that neither friction nor gravity is essential for homogeneous crystallization in driven granular media.
