Dynamics of a projectile penetrating in granular systems

M. Hou, Z. Peng, R. Liu, K. Lu, C. K. Chan

研究成果: 雜誌貢獻期刊論文同行評審

55 引文 斯高帕斯(Scopus)


The impact of a sphere with velocity u0 on a fine, loose granular system under the acceleration due to gravity has been studied by fast video photography. The behavior of the granular bed is found to be similar to a fluid during initial impact, followed by a cavity drag during projectile penetration. From the trajectory of the projectile it is found that the drag on the projectile can be well described by adding a bulk frictional force f to the hydrostatic force kz where k is a constant and z denotes the penetration depth. Both k and f are u0 dependent. This form of the drag force suggests that fluidlike viscous dissipations in the bed can be neglected in these three-dimensional (3D) experiments. However, due to the imposed boundary this hydrodynamic term of the drag force is found to be not negligible in quasi-2D granular beds.

期刊Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
出版狀態已出版 - 12月 2005


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