Abstract A numerical investigation on the effects of inter-particle friction and particle sphericity on isotropic compression in real-shaped sand assemblies is carried out using the discrete element method. Real-shaped sand assemblies are generated in terms of the cumulative distribution of the shape descriptor (sphericity) of real sand particles. The mechanical behaviors of compression are quantified in terms of the volumetric deformation, coordination number, probability distribution of the contact forces, and fabric. The results show that the compression deformation becomes larger with decreasing inter-particle friction, especially for an assembly with frictionless particles. The probability distribution of the coordination number is almost described by a Gaussian distribution, which is somewhat different from that of the monodisperse particles reported in previous studies. Moreover, the inter-particle friction and sphericity have an insignificant effect on the probability distribution of the normalized contact forces, which exhibit a clear exponential decay. Assemblies with lower inter-particle friction and lower sphericity experience greater friction mobilization during compression. The results of the anisotropy of the contact normal force show that all the samples are strongly homogeneous and isotropic, and inter-particle friction and sphericity have substantial effects on the magnitude of the normal contact force.

中文翻译：

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颗粒间摩擦和颗粒球形度对实形砂组件各向同性压缩行为的影响

摘要 采用离散元法，数值研究了颗粒间摩擦和颗粒球度对实形砂组合体各向同性压缩的影响。根据真砂颗粒的形状描述符（球形度）的累积分布生成真砂组件。压缩的力学行为根据体积变形、配位数、接触力的概率分布和织物进行量化。结果表明，压缩变形随着颗粒间摩擦的减小而变大，特别是对于具有无摩擦颗粒的组件。配位数的概率分布几乎可以用高斯分布来描述，这与之前研究中报道的单分散颗粒有些不同。此外，粒子间摩擦和球形度对归一化接触力的概率分布影响不显着，表现出明显的指数衰减。具有较低颗粒间摩擦和较低球形度的组件在压缩过程中会经历更大的摩擦移动。接触法向力各向异性的结果表明，所有样品都具有很强的均匀性和各向同性，颗粒间摩擦和球形度对法向接触力的大小有很大的影响。表现出明显的指数衰减。具有较低颗粒间摩擦和较低球形度的组件在压缩过程中会经历更大的摩擦移动。接触法向力各向异性的结果表明，所有样品都具有很强的均匀性和各向同性，颗粒间摩擦和球形度对法向接触力的大小有很大的影响。表现出明显的指数衰减。具有较低颗粒间摩擦和较低球形度的组件在压缩过程中会经历更大的摩擦移动。接触法向力各向异性的结果表明，所有样品都具有很强的均匀性和各向同性，颗粒间摩擦和球形度对法向接触力的大小有很大的影响。