撞击物在二维颗粒床中穿行的运动过程

J4 ›› 2009, Vol. 44 ›› Issue (7): 29-32.

撞击物在二维颗粒床中穿行的运动过程

张权义^1,2,何润²,刘锐²,厚美瑛²

1 贵州省铜仁学院物理系,贵州铜仁 554300；  2. 中国科学院物理研究所，北京凝聚态物理国家实验室, 北京 100190

收稿日期:2008-12-04 出版日期:2009-07-16 发布日期:2009-11-01
通讯作者: 张权义(1958-),女,教授,主要从事物理教学及实验研究.Email: trzqy@sina.com
作者简介:张权义(1958-),女,教授,主要从事物理教学及实验研究.Email: trzqy@sina.com
基金资助:
国家自然科学基金资助项目(10474124)

Projectile impact and penetration in a twodimensional g ranular bed

ZHANG Quanyi^1,2, HE Run², LIU Rui², HOU Meiying²

1. Department of Physics, Tongren Institute, Tongren 554300, Guizhou, China; 2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

Received:2008-12-04 Online:2009-07-16 Published:2009-11-01

摘要/Abstract

摘要：

用高速摄像和加速度传感器观测方法研究物体在重力加速度作用下撞击二维颗粒床并在其中穿行的运动过程。由高速摄像可以清楚地观察到床颗粒受撞击后的位移分布情形,揭示了颗粒床被流化的区域及程度和可能产生喷流的物理机制。流化区域仅限于撞击物路径附近，反应了颗粒介质的强耗散特性。通过加速度传感器直接测量撞击物在运动过程中所受阻力,与在液体中穿行阻力进行了比较。相关的实验数据反映了在这样的二维体系中,撞击物受到不可忽略的与速度相关的阻力作用。

关键词: 颗粒物质; 撞击; 流化

Abstract:

Projectile impact and penetration in a 2D granular bed under the acceleration due to gravity was been studied by fast video photograph and acceleration sensors. The distribution of displacement of the granular bed after impact can be clearly observed by highspeed video photograph. Granular jet formation and the penetration regime of the projectile shown in the experiment, reflect the properties of energy dissipation of granular mediums. The acceleration sensor can directly measure drag forces of the projectile in the movement, and these forces compare with hydrostatic drag forces during penetration. Experimental data obtained by comparison showed that considerable drag forces act on the projectile and these forces are related to velocity.

Key words: particulate matter; impact; flow

中图分类号:

O345

. 撞击物在二维颗粒床中穿行的运动过程[J]. J4, 2009, 44(7): 29-32.

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