TY - JOUR
T1 - The viscoelastic-like response of a repulsive granular medium during projectile impact and penetration
AU - Escobar-Ortega, Y. Y.
AU - Hidalgo-Caballero, S.
AU - Marston, J. O.
AU - Pacheco-Vázquez, F.
N1 - Funding Information:
This research was supported by CONACyT Mexico and VIEP-Project 2019.
Publisher Copyright:
© 2020
PY - 2020/6
Y1 - 2020/6
N2 - We study experimentally the penetration of a projectile into a two-dimensional granular bed composed of magnetic repelling grains. The projectile can experience either repulsive, attractive or neutral interaction with the particles generating different dynamics: i) the repulsive intruder compresses the granular bed without contact and experiences rebounds before stopping; ii) the attractive intruder is first accelerated when it approaches the bed, then, some magnets attach to its surface increasing its effective diameter and the drag force acting on the intruder until it reaches the repose; and iii) the neutral projectile penetrates deeper into the granular bed than in the two previous cases because there is no magnetic interaction with the particles. In addition, we developed molecular dynamics simulations able to reproduce the experimental results and used to determine the effect of the magnetic strength and the role of friction between the particles and the container walls. The results show that the medium behaves similar to a viscoelastic micellar fluid on impact, and the projectile dynamics can be modelled by a spring-dashpot model. Our findings can be useful in the design of new magnetic granular dampers.
AB - We study experimentally the penetration of a projectile into a two-dimensional granular bed composed of magnetic repelling grains. The projectile can experience either repulsive, attractive or neutral interaction with the particles generating different dynamics: i) the repulsive intruder compresses the granular bed without contact and experiences rebounds before stopping; ii) the attractive intruder is first accelerated when it approaches the bed, then, some magnets attach to its surface increasing its effective diameter and the drag force acting on the intruder until it reaches the repose; and iii) the neutral projectile penetrates deeper into the granular bed than in the two previous cases because there is no magnetic interaction with the particles. In addition, we developed molecular dynamics simulations able to reproduce the experimental results and used to determine the effect of the magnetic strength and the role of friction between the particles and the container walls. The results show that the medium behaves similar to a viscoelastic micellar fluid on impact, and the projectile dynamics can be modelled by a spring-dashpot model. Our findings can be useful in the design of new magnetic granular dampers.
KW - Impacts on grains
KW - Magnetic granular dampers
KW - Viscoelasticity
UR - http://www.scopus.com/inward/record.url?scp=85084178472&partnerID=8YFLogxK
U2 - 10.1016/j.jnnfm.2020.104295
DO - 10.1016/j.jnnfm.2020.104295
M3 - Article
AN - SCOPUS:85084178472
VL - 280
JO - Journal of Non-Newtonian Fluid Mechanics
JF - Journal of Non-Newtonian Fluid Mechanics
SN - 0377-0257
M1 - 104295
ER -