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Shock and Vibration
Volume 2017 (2017), Article ID 5624534, 11 pages
https://doi.org/10.1155/2017/5624534
Research Article

Effect of Nonsmooth Nose Surface of the Projectile on Penetration Using DEM Simulation

1College of Mechatronic Engineering, North University of China, Shanxi, Taiyuan 030051, China
2National Defense Key Discipline Laboratory of Underground Target Damage, Shanxi, Taiyuan 030051, China

Correspondence should be addressed to Jing Han

Received 17 July 2017; Revised 19 September 2017; Accepted 28 September 2017; Published 21 November 2017

Academic Editor: Giosuè Boscato

Copyright © 2017 Jing Han et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The nonsmooth body surface of the reptile in nature plays an important role in reduction of resistance and friction when it lives in a soil environment. To consider whether it was feasible for improving the performance of penetrating projectile we investigated the influence of the convex as one of nonsmooth surfaces for the nose of projectile. A numerical simulation study of the projectile against the concrete target was developed based on the discrete element method (DEM). The results show that the convex nose surface of the projectile is beneficial for reducing the penetration resistance greatly, which is also validated by the experiments. Compared to the traditional smooth nose structure, the main reason of difference is due to the local contact normal pressure, which increases dramatically due to the abrupt change of curvature caused by the convex at the same condition. Accordingly, the broken particles of the concrete target obtain more kinetic energy and their average radial flow velocities will drastically increase simultaneously, which is in favor of decreasing the interface friction and the compaction density of concrete target around the nose of projectile.