Collapse modes in compressed simple cubic (SC) and body-centered cubic (BCC) periodic arrangements of elastic frictionless beads were studied numerically using the discrete element method. Under pure hydrostatic compression, the SC arrangement tends to transform into a defective hexagonal close-packed or amorphous structure. The BCC assembly exhibits several modes of collapse, one of which, identified as cI16 structure, is consistent with the behavior of BCC metals Li and Na under high pressure. The presence of a deviatoric stress leads to the transformation of the BCC structure into face-centered cubic (FCC) one via the Bain path. The observed effects expand the knowledge on possible packings of soft elastic spheres and transformations between them, while providing an unexpected link with the mechanical behavior of certain atomic systems.

中文翻译：

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弹性珠粒的简单立方和以人体为中心的立方排列中的塌陷模式

使用离散元方法，对弹性无摩擦小珠的压缩简单立方（SC）和体心立方（BCC）周期性排列中的塌陷模式进行了数值研究。在纯静液压压缩下，SC排列趋于转变为有缺陷的六方密堆积或非晶态结构。BCC组件表现出多种塌陷模式，其中一种被识别为cI16结构，与BCC金属Li和Na在高压下的行为一致。偏应力的存在会导致BCC结构通过贝恩路径转变为面心立方（FCC）。观察到的效应扩大了对软弹性球体可能堆积和它们之间的转换的认识，同时为某些原子系统的机械行为提供了意想不到的联系。