Rapid compaction of granular material: characterizing two- and three-dimensional mesoscale simulations

Borg, John P.; Vogler, Tracy

doi:10.1007/s00193-012-0423-6

Cited by 36 publications

(19 citation statements)

References 50 publications

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“…Just as in a continuum mechanical model, grain fracture is not modeled explicitly, but represented as inner friction in the material. Examples of more advanced simulations using mesoscale models of the sand can be found in [45] and [46].…”

Section: A Particle-based Methods To Model Bullet Penetration In Sandmentioning

confidence: 99%

Penetration of granular materials by small-arms bullets

Dey¹,

Olovsson

2015

International Journal of Impact Engineering

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This paper presents an experimental and numerical study on the penetration of granular materials by small-arms bullets. In the experimental tests, five different types of granular material (0-2 mm wet sand, 0-2 mm dry sand, 2-8 mm gravel, 8-16 mm crushed stone and 16-22 mm crushed rock) were impacted by four different types of smallarms bullets (7.62 mm Ball with a soft lead core, 7.62 mm AP with a hard steel core, 12.7 mm Ball with a soft steel core and 12.7 mm AP with a tungsten carbide core). The tests were carried out using different rifles to fire the projectiles, while the granular materials were randomly packed in a 320 mm diameter specially-designed steel tube. In all tests, the initial projectile velocity and the depth of penetration in the granular material were measured for each bullet type. In the numerical simulations, a discrete particle-based approach was used to model the behaviour of sand during bullet impact. The method works with discrete particles that transfer forces between each other through contact and elastic collisions, allowing for a simple and robust treatment of the interaction between the sand particles and the bullet which is represented by finite elements. An important observation from the study is that the penetration depth in dry sand is strongly influenced by deviation of the bullet from its original trajectory.Good agreement between the available experimental results and the numerical predictions is also in general obtained.

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Section: A Particle-based Methods To Model Bullet Penetration In Sandmentioning

confidence: 99%

Penetration of granular materials by small-arms bullets

Dey¹,

Olovsson

2015

International Journal of Impact Engineering

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“…In particular, it is common in mesoscale simulations to use either a single grain arrangement or different random arrangements when constructing a synthetic Hugoniot curve for the particle system. Yet, grain arrangement has been shown to have a discernible effect on shock response [11,[19][20][21] with some studies directly investigating the effects of varying bed structure [18,21]. In general, these investigations quantify variation in structure between particle beds by the exposure to their respective bed-generation algorithms.…”

Section: Introductionmentioning

confidence: 99%

“…Such simulations explicitly resolve hundreds-to-thousands of grains, such that microscale effects are present but the bulk response is also considered. This direct link between the micro-and macroscales has proven instrumental in furthering understanding of granular dynamics in shock compaction [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…However, as more microscale effects are implemented there is also a need to consider the effects of certain model assumptions that are poorly tested [11,18]. In particular, it is common in mesoscale simulations to use either a single grain arrangement or different random arrangements when constructing a synthetic Hugoniot curve for the particle system.…”

Section: Introductionmentioning

confidence: 99%

“…Several recent mesoscale simulation studies have investigated the effects of specific microscale phenomena, such as sensitivity to intergranular shear resistance [11,15], grain morphology [16] and grain fracture [17], on the macroscale shock response of particle systems. However, as more microscale effects are implemented there is also a need to consider the effects of certain model assumptions that are poorly tested [11,18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mesoscale simulations of shock compaction of a granular ceramic: effects of mesostructure and mixed-cell strength treatment

Derrick

LaJeunesse

Davison

et al. 2018

Modelling Simul. Mater. Sci. Eng.

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The shock response of granular materials is important in a variety of contexts but the precise dynamics of grains during compaction is poorly understood. Here we use 2D mesoscale numerical simulations of the shock compaction of granular tungsten carbide to investigate the effect of internal structure within the particle bed and 'stiction' between grains on the shock response. An increase in the average number of contacts with other particles, per particle, tends to shift the Hugoniot to higher shock velocities, lower particle velocities and lower densities. This shift is sensitive to inter-particle shear resistance. Eulerian shock physics codes approximate friction between, and interlocking of, grains with their treatment of mixed cell strength (stiction) and here we show that this has a significant effect on the shock response. When studying the compaction of particle beds it is not common to quantify the pre-compaction internal structure, yet our results suggest that such differences should be taken into account, either by using identical beds or by averaging results over multiple experiments.

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Low-Pressure Dynamic Compression Response of Porous Materials

Fredenburg

Vogler

2019

Shock Wave and High Pressure Phenomena

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Rapid compaction of granular material: characterizing two- and three-dimensional mesoscale simulations

Cited by 36 publications

References 50 publications

Penetration of granular materials by small-arms bullets

Penetration of granular materials by small-arms bullets

Mesoscale simulations of shock compaction of a granular ceramic: effects of mesostructure and mixed-cell strength treatment

Low-Pressure Dynamic Compression Response of Porous Materials

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