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arXiv 2201.04541cond-mat.softcond-mat.dis-nncond-mat.mtrl-scicond-mat.stat-mech
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d=2和d=3时随机密堆积的显式解析解

Explicit Analytical Solution for Random Close Packing in d=2 and d=3

Alessio Zaccone

摘要:

我们提出了一个分析推导的体积分数为随机密堆积(RCP)在$d=3$和$d=2$,基于相同的方法。对硬球采用适当修正的最近邻统计量,得到了$d=3$中的$ϕ_{\mathrm{RCP}}=0.65896$和$d=2$中的$ϕ_{\mathrm{RCP}}=0.88648$.这些值在文献中使用不同方法(实验和数值模拟)和方案报告的值的区间内。这种顺序不可知的推导提出了一些与RCP的性质有关的考虑:(i)RCP对应于出现有限剪切模量的机械刚性的开始,(ii)机械刚性的开始标志着最大随机堵塞状态,并通过配位数$z$指示$ϕ_{\mathrm{RCP}}$,(iii)具有$ϕ>ϕ_{\mathrm{RCP}}$的无序填充是可能的,但代价是产生某种有序,并且FCC极限下的$z=12$充当边界条件。

英文摘要:

We present an analytical derivation of the volume fractions for random close packing (RCP) in both $d=3$ and $d=2$, based on the same methodology. Using suitably modified nearest neigbhour statistics for hard spheres, we obtain $ϕ_{\mathrm{RCP}}=0.65896$ in $d=3$ and $ϕ_{\mathrm{RCP}}=0.88648$ in $d=2$. These values are well within the interval of values reported in the literature using different methods (experiments and numerical simulations) and protocols. This order-agnostic derivation suggests some considerations related to the nature of RCP: (i) RCP corresponds to the onset of mechanical rigidity where the finite shear modulus emerges, (ii) the onset of mechanical rigidity marks the maximally random jammmed state and dictates $ϕ_{\mathrm{RCP}}$ via the coordination number $z$, (iii) disordered packings with $ϕ>ϕ_{\mathrm{RCP}}$ are possible at the expense of creating some order, and $z=12$ at the FCC limit acts as a boundary condition.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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