Protocol dependence of mechanical properties in granular systems
Protocol dependence of mechanical properties in granular systems
复制标题
颗粒系统中机械性能的协议依赖性
DOI：
10.1140/epje/i2011-11124-6
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
and Shin-ichi Sasa
中科院分区：
文献类型：
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作者：
Shio Inagaki;Michio Otuski;and Shin-ichi Sasa
通过计算机模拟研究了颗粒介质力学性质的协议依赖性。我们控制一个协议，实现磁盘包装系统的方式。在2D中，通过保持成分的材料特性相同，我们以各种应变率进行压实。盘填料表现出的临界包装分数的应变率依赖性以上的压力变得非零。所观察到的行为与无摩擦盘填料的充分研究的堵塞过渡形成对比。我们还观察到，圆盘填料的弹性模量依赖于应变率的热力学。我们的研究结果表明，存在一个依赖于时间的状态变量来描述宏观材料性质的磁盘包装，这取决于它的协议。
We study the protocol dependence of the mechanical properties of granular media by means of computer simulations. We control a protocol of realizing disk packings in a systematic manner. In 2D, by keeping material properties of the constituents identical, we carry out compaction with various strain rates. The disk packings exhibit the strain rate dependence of the critical packing fraction above which the pressure becomes non-zero. The observed behavior contrasts with the well-studied jamming transitions for frictionless disk packings. We also observe that the elastic moduli of the disk packings depend on the strain rate logarithmically. Our results suggest that there exists a time-dependent state variable to describe macroscopic material properties of disk packings, which depend on its protocol.