实验发现，棒在颗粒物质中运动时滑动摩擦力具有准周期振荡性质。
It is found that sliding friction between continuous medium and granular materials has a novel speciality of quasi-periods oscillatory.
形态有片、带、环、圈丝、棒材、颗粒、粉末等。
Patterns have films, belt , ring , ring wire, rod, particle, powder and so on.
通过实验研究了圆棒在颗粒物质中受到的摩擦力与颗粒填充高度及棒径的关系。
The dependence of the static friction force on a rod immersed in granular matter on the filling height of granules and the diameter of the rod is studied experimentally.
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