Discrete Element Modelling of Dynamic Behaviour of Rockfills forResisting High Speed Projectile Penetration  

作　　者：Tingting Zhao Y.T.Feng Jie Zhang Zhihua Wang Zhiyong Wang 

机构地区：[1]College of Mechanical and Vehical Engineering,Taiyuan University of Technology,Taiyuan,030024,China [2]Zienkiewicz Centre for Computational Engineering,Swansea University,Swansea,SA28PP,UK

出　　处：《Computer Modeling in Engineering & Sciences》2021年第5期721-735,共15页工程与科学中的计算机建模（英文）

基　　金：This work is partially supported by National Natural Science Foundation of China under Grant No.12072217;by Open Fund of State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Beijing,China[Grant No.SKLCRSM19KFA12].The support is gratefully acknowledged.

摘　　要：This paper presents a convex polyhedral based discrete element method for modelling the dynamic behaviour ofrockfills for resisting high speed projectile penetration. The contact between two convex polyhedra is defined by theMinkowski overlap and determined by the GJK and EPA algorithm. The contact force is calculated by a Minkowskioverlap based normal model. The rotational motion of polyhedral particles is solved by employing a quaternionbased orientation representation scheme. The energy-conserving nature of the polyhedral DEM method ensures arobust and effective modelling of convex particle systems. The method is applied to simulate the dynamic behaviourof a rockfill system under impact of a high speed projectile. The rockfill sample is generated by a three-dimensionalVoronoi meso method with a specific particle size distribution. The penetrating process of the projectile strikingthe rockfill target is simulated. Some physical quantities associated with the projectile such as the residual velocity,penetration resistance, and deflection angle are monitored which can reflect the influence of the characteristics ofthe rockfill target on its anti-penetration performance. It can be concluded that the developed polyhedral DEMmethod is a very promising numerical approach in analysing the dynamic behaviour of rockfill systems subject tohigh speed projectile impact.

关 键 词：Discrete element method minkowski overlap polyhedral particles rockfill protection system high speed projectile penetration 

分 类 号：O57[理学—粒子物理与原子核物理]