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Discrete Element Modelling of Dynamic Behaviour of Rockfills for Resisting High Speed Projectile Penetration

Tingting Zhao, Yuntian Feng Orcid Logo, Jie Zhang, Zhihua Wang, Zhiyong Wang

Computer Modeling in Engineering & Sciences, Volume: 127, Issue: 2, Pages: 721 - 735

Swansea University Author: Yuntian Feng Orcid Logo

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Abstract

This paper presents a convex polyhedral based discrete element method for modelling the dynamic behaviour of rockfills for resisting high speed projectile penetration. The contact between two convex polyhedra is defined by the Minkowski overlap and determined by the GJK and EPA algorithm. The contac...

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Published in: Computer Modeling in Engineering & Sciences
ISSN: 1526-1506
Published: Computers, Materials and Continua (Tech Science Press) 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa56836
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Abstract: This paper presents a convex polyhedral based discrete element method for modelling the dynamic behaviour of rockfills for resisting high speed projectile penetration. The contact between two convex polyhedra is defined by the Minkowski overlap and determined by the GJK and EPA algorithm. The contact force is calculated by a Minkowski overlap based normal model. The rotational motion of polyhedral particles is solved by employing a quaternion based orientation representation scheme. The energy-conserving nature of the polyhedral DEM method ensures a robust and effective modelling of convex particle systems. The method is applied to simulate the dynamic behaviour of a rockfill system under impact of a high speed projectile. The rockfill sample is generated by a three-dimensional Voronoi meso method with a specific particle size distribution. The penetrating process of the projectile striking the 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 of the rockfill target on its anti-penetration performance. It can be concluded that the developed polyhedral DEM method is a very promising numerical approach in analysing the dynamic behaviour of rockfill systems subject to high speed projectile impact.
Keywords: Discrete element method; minkowski overlap; polyhedral particles; rockfill protection system; high speed projectile penetration
College: College of Engineering
Issue: 2
Start Page: 721
End Page: 735