Chen Fanxiu, Liu Yuxin, Wang Yuan, Gu Yanji, Yu Yang, Sun Jie
School of Science, Qingdao University of Technology, Qingdao 266520, China.
School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, China.
Materials (Basel). 2023 Aug 3;16(15):5441. doi: 10.3390/ma16155441.
A continuous loading experiment of a two-dimensional granular system was carried out and the experimental data were obtained by digital image correlation (DIC). The deformation field of the granular system and the changing laws of the deflection angle and coordination number of the granules on force chains with time were obtained. Based on the granule element method, the quantitative calculation of contact force was realized, and the internal force chains of the granular system were identified. The effects of contact force between granules and mechanical parameters on the evolution of force chains in a two-dimensional granular system under line loads were analyzed. The formation, evolution, and reconstruction of force chains in a granular system during loading, as well as the influence of the force chain network evolution on the macroscopic mechanical properties of granules were discussed. The experimental results indicated that the evolution of force chains was directly related to the number, geometric properties, and permutation distribution of granules in direct contact with the external load.
对二维颗粒系统进行了连续加载实验，并通过数字图像相关（DIC）获得了实验数据。得到了颗粒系统的变形场以及力链上颗粒的偏转角和配位数随时间的变化规律。基于颗粒元法，实现了接触力的定量计算，并识别了颗粒系统的内力链。分析了颗粒间接触力和力学参数对线荷载作用下二维颗粒系统中力链演化的影响。讨论了颗粒系统在加载过程中力链的形成、演化和重构，以及力链网络演化对颗粒宏观力学性能的影响。实验结果表明，力链的演化与直接接触外部荷载的颗粒数量、几何性质和排列分布直接相关。
