A discrete particle approach to simulate the combined effect of blast and sand impact loading of steel plates

Børvik, Tore; Olovsson, Lars; Hanssen, A.G.; Dharmasena, Kumar P.; Hansson, Håkan; Wadley, H.N.G.

doi:10.1016/j.jmps.2011.03.004

Cited by 87 publications

(151 citation statements)

References 20 publications

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“…A discrete particle-based approach [25] [35] has been developed to model the interaction effects between various media and structural parts. To represent the soil, the method applies discrete, rigid, spherical particles that transfer forces between each other through contact and elastic collisions, while structural parts are represented by finite elements (see Figure 10 a)).…”

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

confidence: 99%

“…3 [25][32] [34]). This method, which is based on a Lagrangian formulation, has several advantages over coupled Lagrangian-Eulerian approaches as both numerical advection errors and severe contact problems are avoided, while at the same time keeping the computational time at a reasonable level.…”

Section: Introductionmentioning

confidence: 99%

“…It works with discrete, rigid, spherical particles that transfer forces between each other through a penalty-based contact formulation. Modelling the sand as discrete particles allows for a numerically simple and robust treatment of its interaction with structural parts represented by finite elements (see [25] and [34]), and several parametric studies for increased understanding of this particular penetration problem have been carried out.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Penetration of granular materials by small-arms bullets

Dey¹,

Olovsson

2015

International Journal of Impact Engineering

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“…We developed a purely Lagrangian Meshless Method applied to modeling the complete Blast Event [16]. The implementation of the Blast Particle Method (BPM) in the IMPETUS Afea Solver R is described in detail in [17] and compared with experimental results in [17,18].…”

Section: Blast Particle Methodsmentioning

confidence: 99%

Modeling fragmentation with new high order finite element technology and node splitting

Olovsson

Limido²,

Lacome³

et al. 2015

EPJ Web of Conferences

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Abstract. The modeling of fragmentation has historically been linked to the weapons industry where the main goal is to optimize a bomb or to design effective blast shields. Numerical modeling of fragmentation from dynamic loading has traditionally been modeled by legacy finite element solvers that rely on element erosion to model material failure. However this method results in the removal of too much material. This is not realistic as retaining the mass of the structure is critical to modeling the event correctly. We propose a new approach implemented in the IMPETUS AFEA SOLVER R based on the following: New High Order Finite Elements that can easily deal with very large deformations; Stochastic distribution of initial damage that allows for a non homogeneous distribution of fragments; and a Node Splitting Algorithm that allows for material fracture without element erosion that is mesh independent. The approach is evaluated for various materials and scenarios: -Titanium ring electromagnetic compression; Hard steel Taylor bar impact, Fused silica Taylor bar impact, Steel cylinder explosion, The results obtained from the simulations are representative of the failure mechanisms observed experimentally. The main benefit of this approach is good energy conservation (no loss of mass) and numerical robustness even in complex situations.

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“…Hence, due to the difficulties associated with physically measuring the distribution of loading, little is known about the underlying physics. Consequently, the majority of research into the mechanisms from buried or sand-impact explosions have been informed through interrogation of numerical anal- [10][11][12][13] that remain to be validated or confirmed through experimental observation.…”

Section: Introductionmentioning

confidence: 99%

Influence of particle size distribution on the blast pressure profile from explosives buried in saturated soils

et al. 2017

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The spatial and temporal distribution of pressure and impulse from explosives buried in saturated cohesive and cohesionless soils has been measured experimentally for the first time. Ten experiments have been conducted at quarterscale, where localised pressure loading was measured using an array of 17 Hopkinson pressure bars. The blast pressure measurements are used in conjunction with high-speed video filmed at 140,000 fps to investigate in detail the physical processes occurring at the loaded face. Two coarse cohesionless soils and one fine cohesive soil were tested: a relatively uniform sand, a well-graded sandy gravel, and a fine-grained clay. The results show that there is a single fundamental loading mechanism when explosives are detonated in saturated soil, invariant of particle size and soil cohesion. It is also shown that variability in localised loading is intrinsically linked to the particle size distribution of the surrounding soil.

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A discrete particle approach to simulate the combined effect of blast and sand impact loading of steel plates

Cited by 87 publications

References 20 publications

Penetration of granular materials by small-arms bullets

Penetration of granular materials by small-arms bullets

Modeling fragmentation with new high order finite element technology and node splitting

Influence of particle size distribution on the blast pressure profile from explosives buried in saturated soils

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