Abstract
The dynamic response of a two-dimensional ordered particle packing composed of nylon-66 spheres 6.35 mm in diameter impacted by a spherical projectile was investigated both experimentally and numerically using the discrete element method (DEM). First, the influence of the number of layers in the particle packing on wave propagation and post-impact movement were examined. As the number of layers increased, the contact forces reaching the base plate decreased together with the rebound velocity of the projectiles. Next, the effects of dissimilar material layers were examined. The spheres in one or two layers of the particle packing were replaced with spheres made of dissimilar materials, that is, alumina ceramic (Al2O3) or steel, and it was found that the scattering of the nylon spheres above the dissimilar material layers increased. The experimental results obtained using force sensors at the base plate showed that the dissimilar material layers reduced the contact forces at the base plate. Furthermore, as the mass of the dissimilar material spheres increased, the magnitude of the contact forces at the base plate decreased, and the rebound velocity of the projectile increased.
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Nishida, M., Tanaka, Y. DEM simulations and experiments for projectile impacting two-dimensional particle packings including dissimilar material layers. Granular Matter 12, 357–368 (2010). https://doi.org/10.1007/s10035-010-0173-z
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DOI: https://doi.org/10.1007/s10035-010-0173-z