The jamming transition and jammed packing structures of hydrogel soft ellipsoids are studied using magnetic resonance imaging techniques. As the packing fraction increases, the fluctuation of local free volume decreases and the fluctuation of particle deformation increases. Effective thermodynamic quantities are obtained by characterizing these fluctuations using k-gamma distributions based on an underlying statistical model for granular materials. Surprisingly, the two granular temperatures measuring the relative fluctuations of both free volume and particle deformation remain basically unchanged as the packing fraction increases. The total configurational entropy is also approximately constant for packing with different packing fractions. The significantly different behaviors of these effective thermodynamic quantities compared with hard sphere systems are further attributed to a statistically affine structural transformation of the packing structures along with particle deformations when the packing fraction changes.

中文翻译：

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卡塞的软椭球填料的结构表征和统计特性

利用磁共振成像技术研究了水凝胶软椭球体的阻塞过渡和阻塞堆积结构。随着填充分数的增加，局部自由体积的波动减小，并且颗粒变形的波动增大。通过使用k表征这些波动来获得有效的热力学量-gamma分布基于颗粒材料的基本统计模型。出人意料的是，随着填充率的增加，测量自由体积和颗粒变形的相对波动的两个颗粒温度基本保持不变。对于具有不同填充分数的填充，总构型熵也近似恒定。与硬球系统相比，这些有效热力学量的行为显着不同，这还归因于填料比重变化时填料结构的统计仿射结构转变以及颗粒变形。