全部

力学与实践 ›› 2009, Vol. 31 ›› Issue (4): 64-68.doi: 10.6052/1000-0879-2008-219

• 应用研究 • 上一篇    下一篇

小筒仓内颗粒中探测棒受到的最大静摩擦力

白光富 胡林 张忠政 曲东升 汤燕 吴宇   

  1. 贵州大学理学院物理系
  • 收稿日期:2008-04-23 修回日期:2009-02-20 出版日期:2009-08-08 发布日期:2009-08-08

STATIC FRICTION FORCE ON PROBING ROD IN GRANULARPILE IN SMALL CONTAINER$

BAI Guang-Fu   

  • Received:2008-04-23 Revised:2009-02-20 Online:2009-08-08 Published:2009-08-08

摘要: 用实验方法研究了筒仓内大小均匀的颗粒堆中央的竖直探测棒被提拉时 受到的最大静摩擦力$F$. 研究发现当筒仓的器壁和探测棒之间的距离小于50个颗粒直径时, $F$明显大于连续介质模型得出的结果;当筒仓直径$D$较小时$F$还与探测棒的形 状有关. $F$的奇异变化主要是因为$D$较小时离散的颗粒体系不能近似为连续介质, 颗粒堆中力链起主要作用.

关键词: 颗粒物质, 最大静摩擦力, 边界条件

Abstract: Experiments were conducted to investigate the maximum static friction force on a dragged probing rod in the uniform granular pile contained in a cylindrical vessel. It is observed that the force obtained is greater than that of Jassen Model, when the gap between the wall and the rod is smaller than 50 times of the spheres diameter. When the diameter of vessel is small, the force is related to the shape of the detecting rod. This strange behavior is due to the fact that the scattered granular can not be approximated as a continuum medium when the diameter (D) is small. The force chain in the granular pile plays a major role.

Key words: Granular materials, Maximum static friction force, Boundary condition