摘要
通过实验研究了颗粒体系内部的空洞对整个颗粒体系的影响.当在颗粒体系中向上提拉探测棒时,棒下端即刻产生空洞.由于空洞的存在,将导致整个颗粒体系内部结构的崩塌,崩塌的情况可通过测定棒受到的摩擦力来研究.实验发现整个体系崩塌的时间t与空洞产生的深度h间存在着一个指数的对应关系,即t正比于exp(h/λ),并且这个关系不随颗粒尺寸的变化而改变.同时,还进行了二维的辅助实验,对颗粒体系内部的情况进行了较为细致的观察.
The cavity effect in granular matter is studied experimentally. When pulling a stick out the granular matter, it create a sustained cavity under it, and all the system＇s construction will be breakdown because of the cavity, the breakdown situation can be explored by the friction force of the stick. The relationship between the breakdown time t and the cavity＇s depth h is exponential, t is proportion to exp（h/λ） that we obtained by experiment, and it is unaffected by changing the granular size. We do an two-dimension experiment at the same time, to understand the inside situation of the granular matter clearly.
出处
《大学物理》
北大核心
2006年第9期55-58,共4页
College Physics
基金
国有自然科学基金资助项目(10374021)
贵州省科技厅基金资助项目(20043016)
贵州省高层次人才基金资助项目
关键词
颗粒物质
空洞
力链
崩塌时间
granular matter
cavity
force chain
breakdown time
