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Influence of particle rotation on the oblique penetration in granular media

机译：颗粒旋转对颗粒介质中倾斜渗透的影响

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摘要

The rotation of a particle has significant influence on the dynamic response of a granular bed subjected tonthe oblique impact of a spherical projectile. Based on the discrete element method, the dynamical behaviornof two-dimensional granular media impacted obliquely by rotating particles has been examined in this work,nespecially for the influence of rotational angular velocity on its penetration depth. The simulations show thatnthe incident rotational velocity will not only act on the characteristics of velocity distribution of the bed afternimpacting, but also influence the trajectory of the projectile qualitatively. For low angular velocities, particlenrotations will significantly increase the vertical penetration depths, while the different directions of rotation willnexert opposite effects on the horizontal penetration depths. In addition, the influence of particle rotation on itsnpenetration depth will be enhanced with increasing angular velocity, but such effect will reach an asymptoticnplateau for sufficiently large angular velocities. This indicates that the angular velocity has an obvious criticality.nFurthermore, the variation of critical angular velocity may be linear with the impact velocity and square withnthe impacting angle, approximately. Finally, the influence of the initial particle rotation on the scaling law ofnpenetration depth is also considered, and we find that the linear scaling with impact velocity is still applicablenfor most impact conditions.
机译：颗粒的旋转对球形弹丸的倾斜冲击作用下的粒状床的动力响应具有重大影响。基于离散元方法，研究了旋转颗粒倾斜作用的二维颗粒介质的动力学行为，特别是旋转角速度对其穿透深度的影响。仿真表明，入射旋转速度不仅会影响撞击后基床的速度分布特征，而且会定性地影响弹丸的运动轨迹。对于低角速度，粒子旋转会显着增加垂直穿透深度，而不同的旋转方向将对水平穿透深度产生相反的影响。另外，随着角速度的增加，粒子旋转对其穿透深度的影响将增强，但是对于足够大的角速度，这种影响将达到渐近平台。这表明角速度具有明显的临界性。n此外，临界角速度的变化可能与冲击速度成线性关系，与冲击角成正比。最后，还考虑了初始粒子旋转对穿透深度定标律的影响，发现在大多数冲击条件下，具有冲击速度的线性定标仍然适用。

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  • 来源
    《PHYSICAL REVIEW E》 |2012年第6期|1-12|共12页
  • 作者

    Xiaoyan Ye; Dengming Wang; Xiaojing Zheng;

  • 作者单位

    Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of Chinaand Department of Mechanics and Engineering Sciences College of Civil Engineering and MechanicsLanzhou University Lanzhou Gansu 730000 People’s Republic of China;

    Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of Chinaand Department of Mechanics and Engineering Sciences College of Civil Engineering and MechanicsLanzhou University Lanzhou Gansu 730000 People’s Republic of China;

    Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of Chinaand Department of Mechanics and Engineering Sciences College of Civil Engineering and MechanicsLanzhou University Lanzhou Gansu 730000 People’s Republic of China;

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