Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9801333 | Science and Technology of Advanced Materials | 2005 | 5 Pages |
Abstract
Dynamics of a projectile impacting on a loose granular bed under the acceleration due to gravity g has been studied by fast video photograph. Granular jet formation and projectile penetration are observed in 3D and quasi-2D experiments. It is found that the penetration velocity u can be described by mdu/dt=âγuâκz+mgâ², where γ and κ are the parameters which characterize the viscous damping and hydrostatic drag forces of the bed, respectively, z is the penetration distance of the projectile, and gâ² is a modified gravity term. The viscous damping term is found important in quasi-2D experiments. For 3D, the damping term is only important at the beginning of the impact, and can be neglected during penetration.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
M. Hou, Z. Peng, R. Liu, Y. Wu, Y. Tian, K. Lu, C.K. Chan,