Penetration Effect of Penetrator Geometry and Interface Friction on Rotational Penetration Resistance
Penetration Effect of Penetrator Geometry and Interface Friction on Rotational Penetration Resistance
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DOI：
10.1061/9780784484708.024
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发表时间：
2023-03
期刊：
影响因子：
--
通讯作者：
Yong Tang;Junliang Tao
中科院分区：
文献类型：
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作者：
Yong Tang;Junliang Tao
作者先前的一项研究表明，圆柱体锥体的旋转运动可以显著降低侵彻阻力。研究了弹丸几何形状和弹丸界面摩擦力的影响，为自挖穴机器人的设计提供了理论依据。用离散元方法在不同尺度上研究了侵彻材料与颗粒介质的相互作用。一般情况下，锥体上的侵彻力随侵彻深度的增加而增大，随相对滑移速度(旋转速度与垂直速度之比，Vr/v)的增大而减小。在相同条件下，锥体上的侵彻力按正方形、十边形和平端侵彻的顺序增加，这是由于横截面面积的原因。此外，锥体上的穿透力也随着界面摩擦的增加而增大。力链网络和粒子轨迹可视化了不同侵彻几何形状下粒子尺度上的旋转效应。总体而言，随着相对滑移速度的增加，锥体上的归一化侵彻力先急剧减小，然后逐渐减小。在相同的相对滑移速度下，平头穿甲弹在锥面上的归一化侵彻力大于正方形和十边形穿甲弹。在相同的相对滑移速度下，随着界面摩擦力的增大，锥体上的归一化侵彻力进一步减小。
A previous study by the authors showed that the rotational movement of a cylindrical cone penetrator could significantly reduce penetration resistance. The effects of penetrator geometry and penetrator-particle interface friction are studied to shed light on the design of a self-burrowing robot in this study. The penetrator-granular media interactions were investigated at different scales by using the discrete element method. Generally, the penetration force on the cone increases with the penetration depth but decreases with the relative slip velocity (the ratio between the rotational velocity and the vertical velocity,vr/v). The penetration force on the cone increases in the sequence of square, decagon, and flat-end penetrators under the same conditions due to the cross section areas. Besides, the penetration force on the cone also increases with the interface friction. Force chain network and particle trajectory visualize the rotational effect at particle-scale with different penetrator geometries. Overall, the normalized penetration force on the cone decreases dramatically at first and then gradually with the increase of the relative slip velocity. The normalized penetration force on the cone for flat-end penetrator is higher than that for square and decagon penetrators under same relative slip velocity. The normalized penetration force on the cone decreases further with the increase of the interface friction under the same relative slip velocity.