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arXiv 2008.01895cond-mat.soft
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有序和无序圆盘填料中接触网络的变化

Contact network changes in ordered and disordered disk packings

P. J. Tuckman, K. VanderWerf, Y. Yuan, S. Zhang, J. Zhang, M. D. Shattuck, C. S. O'Hern

摘要:

研究了纯排斥无摩擦圆盘填充对准静态变形的力学响应。变形包括简单的剪切应变在恒定的填充分数和在恒定的压力下,“多分散性”的应变(其中我们改变颗粒尺寸分布)在恒定的填充分数和在恒定的压力下,和各向同性压缩。对于每种变形,我们表明颗粒间接触网络中存在两类变化:跳跃变化和点变化。当接触网络变得机械不稳定时,发生跳跃变化,颗粒“重新排列”,并且势能(当应变以恒定填充分数施加时)或焓(当应变以恒定压力施加时)以及所有导数都是不连续的。在点更改期间,单个接触将添加到接触网络或从接触网络中删除。对于排斥性线性弹簧相互作用,势能/焓的二阶和高阶导数在点变化处是不连续的,而对于赫兹相互作用,势能/焓的三阶和高阶导数是不连续的。我们说明了点的变化的重要性,通过研究从六方晶体到无序晶体施加多分散性应变引起的过渡。在此过渡期间,系统只经历点变化,没有跳跃变化。我们强调,必须了解点的变化,以及跳跃的变化,预测堵塞填料的机械性能。

英文摘要:

We investigate the mechanical response of packings of purely repulsive, frictionless disks to quasistatic deformations. The deformations include simple shear strain at constant packing fraction and at constant pressure, "polydispersity" strain (in which we change the particle size distribution) at constant packing fraction and at constant pressure, and isotropic compression. For each deformation, we show that there are two classes of changes in the interparticle contact networks: jump changes and point changes. Jump changes occur when a contact network becomes mechanically unstable, particles "rearrange", and the potential energy (when the strain is applied at constant packing fraction) or enthalpy (when the strain is applied at constant pressure) and all derivatives are discontinuous. During point changes, a single contact is either added to or removed from the contact network. For repulsive linear spring interactions, second- and higher-order derivatives of the potential energy/enthalpy are discontinuous at a point change, while for Hertzian interactions, third- and higher-order derivatives of the potential energy/enthalpy are discontinuous. We illustrate the importance of point changes by studying the transition from a hexagonal crystal to a disordered crystal induced by applying polydispersity strain. During this transition, the system only undergoes point changes, with no jump changes. We emphasize that one must understand point changes, as well as jump changes, to predict the mechanical properties of jammed packings.

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