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中文摘要：
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.根据颗粒物质的剪胀性对此现象进行了研究,提出相应的物理模型,建立了平均体积分数振荡方程和滑动摩擦力振荡变化关系式,理论计算分析结果与实验结果基本吻合.
英文摘要：
It is found that sliding friction between continuous medium and granular materials has a novel speciality of quasi-periods oscillatory. According to the shearing dilatancy of granular materials, this novel phenomenon is studied. Aphysical model i, proposed to explain the experimental results and presents an equation about average density oscillating in the effective region. It addition, a function about sliding friction is elicited. The theoretical results accord well with the experimental results.
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