Numerical simulations of ceramic target subjected to ballistic impact using combined DEM/FEM approach

Kudryavtsev, O. A.; Сапожников, С. Б.

doi:10.1016/j.ijmecsci.2016.04.019

Cited by 40 publications

(13 citation statements)

References 51 publications

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“…It can provide tools to study systems which are too large to test, 27 have conditions that would be difficult to replicate, 28 or would be prohibitively expensive to pursue initial prototypes. DEM has also been combined with other methods such as nite element modeling (FEM) to evaluate deformation in shot-peening 29 or powder compaction. 30 In our study, DEM and MBD have been co-simulated to replicate both granular and cra dynamics.…”

Section: Introductionmentioning

confidence: 99%

Helically-driven granular mobility and gravity-variant scaling relations

2019

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Section: Introductionmentioning

confidence: 99%

Helically-driven granular mobility and gravity-variant scaling relations

2019

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“…E c = 60 GPa. Using elastic theory for the bulk and shear modulus [25], the ratio between the shear and normal stiffness for both the DEM and BPM was obtained as…”

Section: Calibrationmentioning

confidence: 99%

A statistical DEM approach for modelling heterogeneous brittle materials

et al. 2021

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By utilizing numerical models and simulation, insights about the fracture process of brittle heterogeneous materials can be gained without the need for expensive, difficult, or even impossible, experiments. Brittle and heterogeneous materials like rocks usually exhibit a large spread of experimental data and there is a need for a stochastic model that can mimic this behaviour. In this work, a new numerical approach, based on the Bonded Discrete Element Method, for modelling of heterogeneous brittle materials is proposed and evaluated. The material properties are introduced into the model via two main inputs. Firstly, the grains are constructed as ellipsoidal subsets of spherical discrete elements. The sizes and shapes of these ellipsoidal subsets are randomized, which introduces a grain shape heterogeneity Secondly, the micromechanical parameters of the constituent particles of the grains are given by the Weibull distribution. The model was applied to the Brazilian Disc Test, where the crack initiation, propagation, coalescence and branching could be investigated for different sets of grain cement strengths and sample heterogeneities. The crack initiation and propagation was found to be highly dependent on the level of heterogeneity and cement strength. Specifically, the amount of cracks initiating from the loading contact was found to be more prevalent for cases with higher cement strength and lower heterogeneity, while a more severe zigzag shaped crack pattern was found for the cases with lower cement strength and higher heterogeneity. Generally, the proposed model was found to be able to capture typical phenomena associated with brittle heterogeneous materials, e.g. the unpredictability of the strength in tension and crack properties.

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“…Furthermore, the internal mechanism of macroscopic response can be revealed from the microscopic level. At present, the study of DEM modelling on dynamic behavior of the rock particle system under impact load is rare, and the traditional DEM with spherical elements is mostly adopted in some penetration problems [11,12]. The fundamental different behaviour of a spherical particle from a polyhedral particle makes the use of spheres to model rockfill systems less reliable.…”

Section: Introductionmentioning

confidence: 99%

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

Zhao¹,

Feng²,

Zhang³

et al. 2021

Computer Modeling in Engineering &Amp; Sciences

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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. KEYWORDSDiscrete element method; minkowski overlap; polyhedral particles; rockfill protection system; high speed projectile penetration This work is licensed under a Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Numerical simulations of ceramic target subjected to ballistic impact using combined DEM/FEM approach

Cited by 40 publications

References 51 publications

Helically-driven granular mobility and gravity-variant scaling relations

Helically-driven granular mobility and gravity-variant scaling relations

A statistical DEM approach for modelling heterogeneous brittle materials

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

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