DEM/FEM Simulations of Dynamic Response of Projectile Penetrating into Granular Medium

Abstract:

Dynamic elastic Finite Element Method (FEM) and Discrete element method (DEM) simulations are carried out to investigate dynamic penetration of a projectile into a target of granular medium. It was found that the highly densified region of granular medium was generated just ahead of the projectile and began to propagate spherically with much higher velocity than that of projectile which leaves relatively rarefied medium region. This propagation phenomenon was probably the result of a collision and momentum transfer between particles in target granular medium. The propagation velocity of the densified region decreased during penetration as depending not only on the packing ratio of target medium but also on the projectile velocity. The resistance force of projectile was also investigated in the case of penetration of projectiles with various body lengths. The resistance force increased rapidly and reached to the peak. The peak value was expressed in terms of momentum change of target particles. The resistance force decreased periodically after the peak value. The period clearly depended on the length of projectile. It is obvious that this was caused by the stress wave reverberations in the projectiles with various body lengths.

• Periodical: Key Engineering Materials (Volume 715)
• Pages: 167-173
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.715.167
• Online since: September 2016
• Authors: Shinnosuke Takeda*, Kinya Ogawa, Kenichi Tanigaki, Keitaro Horikawa, Hidetoshi Kobayashi
• Keywords: DEM, FEM, Granular Medium, Projectile Penetration, Wave Velocity

References

[1] W. A. Allen, E. B. Mayfield, H. L. Morrison, Dynamics of a Projectile Penetrating Sand, J. Appl. Phys., vol. 28, no. 3 (1957) p.370.

[2] M. E. Backman, W. Goldsmith, The mechanics of penetration of projectiles into targets, Int. J. Eng. Sci., vol. 16, no. 1 (1978) p.1–99.

[3] V. G. Bazhenov, A. M. Bragov, V. L. Kotov, Experimental-Theoretical Study of the Penetration of Rigid Projectiles and Identification of Soil Properties, J. Appl. Mech. Tech. Phys., vol. 50, no. 6 (2009) p.1011–1019.

DOI: 10.1007/s10808-009-0135-6

[4] G. E. Hauver, Penetration with instrumented rods, Int. J. Eng. Sci., vol. 16, no. 11 (1978) p.871–877.

DOI: 10.1016/0020-7225(78)90072-1

[5] Y. Zhang, A Study about High-speed Impact Behavior of projectile into particulate materials, Master's thesis for Osaka University, Japan (2013).

[6] K. Ogawa, S. Takeda, H. Kobayashi, K. Tanigaki, Simulation of Dynamic Response of Projectile and Granular Target, EPJ Web Conf., vol. 94 (2015) p.04040.

DOI: 10.1051/epjconf/20159404040