The use of sliding coating layers on structures is investigated as an approach to manipulate the transfer of momentum during the impact of granular matter with rigid and deformable structures. We first report an experimental investigation of the momentum transfer into rigid stationary targets with fixed and sliding coating layer impacted by high velocity granular slugs. Friction between the impacting granular particles and the target surface enhances the momentum transfer during the interaction with the target. By introducing a sliding coating layer with a lubricated target surface-coating interface, the momentum transfer is reduced: the coating slides on the target surface dragged along by friction between the coating and the particles but, the low friction between the coating and the target reduces the transfer of frictional forces into the target. Coupled discrete element and Lagrangian finite element simulations with rod-shaped granular particles are shown to capture the measurements with high fidelity. This numerical approach is then used to investigate the use of sliding coatings on deformable edge-clamped plates. Introduction of a coating layer while keeping the total mass of the plate constant, reduces the thickness of the plates and this in turn reduces their bending strength. The consequence is that momentum transfer reductions are lost as a result of the reduced bending strength and the minimum plate deflection is attained when no coating layer is present. We thus conclude that sliding coating layers can result in momentum transfer reductions when used on relatively rigid targets but result in a degradation of impact resistance performance when used on highly deformable structures.

研究了在结构上使用滑动涂层作为一种在颗粒物质与刚性和可变形结构碰撞期间操纵动量传递的方法。我们首先报告了动量转移到刚性静止目标的实验研究，其中固定和滑动涂层受到高速粒状段塞的影响。撞击颗粒与目标表面之间的摩擦增强了与目标相互作用期间的动量传递。通过引入具有润滑的目标表面-涂层界面的滑动涂层，动量传递减少：涂层在目标表面上滑动，被涂层和颗粒之间的摩擦拖曳，但是，涂层和目标之间的低摩擦减少了摩擦力传递到目标中。显示耦合离散元和拉格朗日有限元模拟与棒状颗粒颗粒以高保真度捕获测量结果。然后使用该数值方法研究在可变形边缘夹紧板上滑动涂层的使用。在保持板的总质量不变的同时引入涂层会降低板的厚度，这反过来又会降低它们的弯曲强度。结果是，由于弯曲强度降低，动量传递减少丢失，并且在不存在涂层时获得最小的板挠度。