Force and flow characteristics of an intruder immersed in 3D dense granular matter--颗粒学报PARTICUOLOGY

Zhang, C., & Ye, X. (2022). Force and flow characteristics of an intruder immersed in 3D dense granular matter. Particuology, 71, 47-55. https://doi.org/10.1016/j.partic.2022.01.007

Force and flow characteristics of an intruder immersed in 3D dense granular matter

Chaofeng Zhang, Xiaoyan Ye ^*

Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China, and Department of Mechanics and Engineering Science, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China

10.1016/j.partic.2022.01.007

Volume 71, December 2022, Pages 47-55

Received 15 July 2021, Revised 14 December 2021, Accepted 5 January 2022, Available online 19 January 2022, Version of Record 23 February 2022.

E-mail: yexy@lzu.edu.cn

Highlights

• Three distinguished resistance regimes are exhibited for varying penetration velocities.

• In quasistatic regime, a force model is proposed to adapt for different intrusion angles.

• Under different penetration velocities and angles, flow characteristics of granular media are traced.

• Rheological model of packing fraction and inertia number is evaluated for different intrusion angles.

Abstract

The motion of a projectile impact onto a granular target results in both the resistance force exerted on the projectile and rheology of granular media. A horizontal arrangement of cylinder quasistatically and dynamically intruding into granular media under different velocities and angles is simulated using discrete element method. Three distinguished drag force regimes are exhibited, including hydrostatic-like force independent of velocity, viscous force related to velocity, and inertial drag force proportional to the square of velocity. Meanwhile, the influence of penetration angles on drag force is examined for these three regimes, and a force model, which is related to penetration depth and angle, is proposed for quasi-static penetration. Then, flow characteristics of the granular media, such as velocity field, pressure field, packing fraction etc., are traced, and a rheology model of packing fraction and inertial number is established.

Graphical abstract

Keywords

Granular media; Resistance forceInertial number; Packing fraction; Oblique penetration

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