论文标题
颗粒可压缩性对压缩软颗粒材料的结构和机械性能的影响
Effects of particle compressibility on structural and mechanical properties of compressed soft granular materials
论文作者
论文摘要
基于有限元和接触动力学方法的组合，研究了粒子内在可压缩性的变化引起的颗粒材料的机械性能的变化。 Athermal 2D颗粒的组件受到准静态单轴压实，直至接近$ 1 $的包装分数。受赫兹极限的接触力学的启发，我们表明粒子的可压缩性对全局和局部应力的影响可以通过仅考虑系统的填充分数来描述。在无摩擦颗粒的情况下，在整个可访问堆积部分中所证明的结果仍然与中等粒子间摩擦系数有关。摩擦颗粒观察到的小差异源自系统中不可逆的局部重组，后来是由于颗粒的可压缩性促进的。
Changes in the mechanical properties of granular materials, induced by variations in the intrinsic compressibility of the particles, are investigated by means of numerical simulations based on the combination of the Finite Element and Contact Dynamics methods. Assemblies of athermal 2D particles are subjected to quasi-static uni-axial compactions up to packing fractions close to $1$. Inspired by the contact mechanics in the Hertz's limit, we show that the effect of the compressibility of the particles both on the global and the local stresses, can be described by considering only the packing fraction of the system. This result, demonstrated in the whole range of accessible packing fractions in case of frictionless particles, remains relevant for moderate inter-particles coefficients of friction. The small discrepancies observed with frictional particles originate from irreversible local reorganizations in the system, the later being facilitated by the compressibility of the particles.
