离散态物质内部的非稳行为及其规律  

Law of the Sliding Friction Force Change in Granular Materials

作　　者：杜学能[1] 胡林[2] 

机构地区：[1]贵州省铜仁师范高等专科学校物理系,贵州铜仁554300 [2]贵州大学理学院及贵州省光电子技术与应用重点实验室,贵州贵阳550025

出　　处：《贵州大学学报（自然科学版）》2006年第3期263-266,共4页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金(10034021);贵州省高层次人才基金(20041227)

摘　　要：用实验方法研究了在离散态颗粒物质中以不同速度向上提拉探测杆时,杆受到的滑动摩擦力.实验结果表明,滑动摩擦力F随测量时间t成非线性上升然后下降.对F进行功率谱分析的结果表明:功率S(f)与频率f存在幂函数的关系,即S(f)∝fβ,-2.0≤β≤-1.0.这现象利用自组织临界模型得到了很好解释.The law of the sliding friction force exerted on a rod immersed in granular matter is studied experimentally. It is observed that the sliding friction force is nonlinear increase with drag time. After analysis through power spectrum, we find that there is power law relationship between power and frequency, namely. It can be explained by models of self-organized criticality.

关 键 词：颗粒物质 滑动摩擦力 功率谱 自组织临界 

分 类 号：O345[理学—固体力学]