Projectile oblique impact on granular media: penetration depth and dynamic process
The motion of a projectile oblique impacting sand bed with deep penetration was captured in experiment. Penetration depth, velocity and acceleration of the projectile were analyzed in terms of kinematic data. Horizontal and vertical penetration depths were measured under a series of impact angles, i...
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Published in | Granular matter Vol. 23; no. 2 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.05.2021
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | The motion of a projectile oblique impacting sand bed with deep penetration was captured in experiment. Penetration depth, velocity and acceleration of the projectile were analyzed in terms of kinematic data. Horizontal and vertical penetration depths were measured under a series of impact angles, impact velocities and projectile diameters, and the collapsed curves were obtained. Specifically, an impact drag force model was assumed, which consists of an inertial term, a linear viscosity term, a linear static term, and a constant term. Then, we confirmed the terms related with velocities for both horizontal and vertical direction at the fixed depth-dependent term and obtained the linear depth-dependent static force at certain velocities. It demonstrated that viscous drag force is significant in deep penetration cases (vertical penetration depths are larger than the diameter of projectiles), but it can be neglected in shallow penetration cases. The generalized phenomenological resistance force model were proposed, which can predict the motion of projectile and resistance force exerted on the projectile by the granular medium at oblique impact cases.
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ISSN: | 1434-5021 1434-7636 |
DOI: | 10.1007/s10035-021-01108-3 |