论文标题
摩擦粒子组件中的分层堵塞
Hierarchical Jamming in Frictional Particle Assemblies
论文作者
论文摘要
存在的假设（Liu和Nagel，Nature 396，21 EP（1998AA））为对这些多种无形固体（胶体，分子和乳液玻璃，胶体和聚合物凝胶，泡沫，泡沫和花生的材料）的分类提供了理论基础。尽管这种简单的分类很有吸引力，但无法捕获这种无定形固体的刚性标准，可以定义相对于特定的变形方向或模式（即剪切，挤出，巩固）。我们通过巩固强胶体凝胶的巩固来考虑这个问题，并发现在巩固强胶体凝胶期间的临界过渡（如在相对正常应力差异中的最大值和最小值所示）直接对应于有向的，摩擦和非骨骼刚性固化。这些结果表明，在这种无定形固体合并过程中，有指导性的，堵塞状态的层次结构，以及粒子尺度相互作用与这些系统的宏观集体行为之间的直接联系。
The postulate of the existence of a jamming phase diagram (Liu and Nagel, Nature 396, 21 EP (1998aa)) provides a theoretical basis for the classification of a wide range of amorphous solids (colloidal, molecular and emulsion glasses, colloidal and polymer gels, foams and granular matter) on the basis of whether these materials are in the jammed or unjammed state. Whilst such simple classification is appealing, it fails to capture that the criterion of rigidity of such amorphous solids may be defined with respect to a particular deformation orientation or mode (i.e. shear, extrusion, consolidation). We consider this problem via the consolidation of strong colloidal gels, and find that the critical transitions during the consolidation of a strong colloidal gel (as indicated by maxima and minima in the relative normal stress difference) correspond directly to directed, frictional and non-frictional rigidity percolation. These results indicate a hierarchy of directed, jammed states during consolidation of such amorphous solids, and a direct link between particle-scale interactions and macroscopic collective behaviour of these systems driven far from equilibrium
