| 小筒仓内颗粒中探测棒受到的最大静摩擦力 |
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| 引用本文： | 白光富,胡林,张忠政,曲东升,汤燕,吴宇. 小筒仓内颗粒中探测棒受到的最大静摩擦力[J]. 力学与实践, 2009, 31(4): 64-68. DOI: 10.6052/1000-0879-2008-219 |
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| 作者姓名： | 白光富 胡林 张忠政 曲东升 汤燕 吴宇 |
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| 作者单位： | 贵州大学理学院物理系 |
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| 基金项目： | 国家自然科学基金(10374021);;贵州省高层次人才基金(20061208);;贵州省省长基金(20061128)资助项目 |
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| 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.
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| 关 键 词： | 颗粒物质 最大静摩擦力 边界条件 |
| 收稿时间： | 2008-04-23 |
| 修稿时间： | 2009-02-20 |
STATIC FRICTION FORCE ON PROBING ROD IN GRANULARPILE IN SMALL CONTAINER |
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| BAI Guangfu , HU Lin , ZHANG Zhongzheng , QU Dongsheng , TANG Yan , WU Yu. STATIC FRICTION FORCE ON PROBING ROD IN GRANULARPILE IN SMALL CONTAINER[J]. Mechanics and Engineering, 2009, 31(4): 64-68. DOI: 10.6052/1000-0879-2008-219 |
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| Authors: | BAI Guangfu HU Lin ZHANG Zhongzheng QU Dongsheng TANG Yan WU Yu |
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| Affiliation: | 2;3;Department of Physics;Guizhou University;Laboratory for Photoelectric Technology and Application;Guiyang 550025;China |
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| Abstract: | Experiments were conducted to investigate themaximum static friction force on a dragged probing rod in the uniform granular pilecontained in a cylindrical vessel. It is observed that the forceobtained is greater than thatof Jassen Model, when the gap between the wall and the rod is smaller than50 times of the spheres diameter. When the diameter of vessel is small,the force is related to theshape of the detecting rod. This strange behavior is due to the factthat the scattered granular can not be approximated as a continuummedium when the diameter (D) is small. The force chain in the granularpile plays a major role. |
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| Keywords: | Granular materials Maximum static friction force Boundary condition |
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