3D DEM Simulation of Crushable Granular Soils under Plane Strain Compression Condition

Wang, Jian Feng; Yan, Haibin

doi:10.1016/j.proeng.2011.07.215

Cited by 16 publications

(9 citation statements)

References 13 publications

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“…In the past, crushing of particles has typically been handled using two major approaches in DEM modelling. One introduces clusters of smaller particles (Cheng et al, 2003;Wang & Yan, 2011;Cil & Alshibli, 2012;Li et al, 2013), whereas the other replaces an individual particle by several child particles with fixed topological characteristics a priori when a pre-set crushing criterion is met (Lobo-Guerrero & Vallejo, 2005;Brosh et al, 2011). The particle replacement approach has been frequently adopted owing to its relatively high computational efficiency as compared to the cluster method.…”

Section: Introductionmentioning

confidence: 99%

A peridynamic investigation on crushing of sand particles

Zhu

Zhao

2019

Géotechnique

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Particle crushing underpins important macroscopic behaviour of granular materials such as yielding, deformation, dilatancy, failure, mobility and packing features. The crushing condition and crushing pattern have commonly been examined for particles subjected to uniaxial loadings. In the real engineering context, a sand grain is typically in contact with several surrounding particles and is hence subjected to multi-directional loadings, a critical condition that has not been well accounted for in most crushing criteria and studies of crushing patterns relevant to discrete-based sand modelling. In this study, the crushing of single sand particles under different loading conditions is examined based on peridynamic simulations. The peridynamic method is found capable of realistically capturing the crushing of a sand particle under uniaxial loadings in terms of crushing load and the crushing pattern observed in experiments, and is able to simulate multi-contact particle crushing where experimental data are relatively scarce. By examining existing crushing criteria, it is found that the numerical results on the crushing load under multiple contacts compare favourably with the maximum contact force criterion, which states that particle crushing occurs when the maximum contact force reaches a threshold. It is observed that the number of child particles after the crushing of a sand particle bears no apparent correlation with the coordination number. The volumes of child particles can be statistically described by a normal or gamma distribution. The findings from the study offer insights into the behaviour of sand particle crushing, which can be useful for future discrete modelling of granular sand where crushing is important.

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Section: Introductionmentioning

confidence: 99%

A peridynamic investigation on crushing of sand particles

Zhu

Zhao

2019

Géotechnique

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“…As previously discussed, the macroscopic behavior of aggregates of terrestrial soil grains under the Earth environment strongly depends on the tensile strength of individual grains (Billam, ; Bolton, ; Lee, ; McDowell & Amon, ; Wang & Yan, ). The tensile strength of a single grain can be indirectly estimated by compressing the grain between flat platens until it fails (Jaeger, ).…”

Section: Methodology and Approachmentioning

confidence: 99%

“…This approach regards each grain as a cluster of spheres that individually interact through connecting bonds that may deform and even break once the load on each grain exceeds its internal strength. Several researchers such as McDowell and Harireche () and Wang and Yan () used spherical clusters for simulating crushable soil grains by DEM simulations. This allowed for simulating grain‐level failures under high stresses but tremendously increased the computation time compared to clumping methods.…”

Section: Introductionmentioning

confidence: 99%

“…However, in both polyhedral and clump elements, each grain is represented by one element that acts as a single rigid body in the sense that deformability is limited to the boundaries of the grain and the grain will not break apart regardless of the forces acting upon it. Therefore, these elements have limited use in simulating crushable grains and studying the failure on the grain level, while it has been asserted that the macroscopic behavior of aggregates of soil grains under the Earth environment strongly depends on the failure strength of individual grains (Billam, ; Bolton, ; Lee, ; McDowell & Amon, ; Wang & Yan, ). Moreover, these techniques cannot effectively simulate highly irregular shape grains characterized by a variety of internal voids and vesicles.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Lunar Soil With Irregularly Shaped, Crushable Grains: Effects of Grain Shapes on the Mechanical Behaviors

2019

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One of the challenges to overcome in Moon mining operations, such as soil handling, drilling, excavation, and wheeled movement, is understanding the mechanical behaviors of lunar soil, which is composed of grains characterized by highly irregular shapes. The impracticality of performing mechanical experiments on lunar soil samples has made computational techniques useful for exploring the mechanical behaviors of lunar soil. This paper uses particle flow code and describes a procedure for simulating lunar soil grains with specific size, shape, and strength distributions. We adopt data from soil samples 64501 and 60501 retrieved in Apollo 16. Lunar soil samples are simulated as assemblies of different shapes of grains consisting of rigid spheres connected through parallel bonds. We classify grains into four categories based on their shape: agglutinate, breccia A, breccia B, and plagioclase. We simulate each grain based on available imaging studies on their shape characteristics. We reveal the significance of grain shape irregularity through angle‐of‐repose tests on samples with and without irregularly shaped agglutinates. Results show that the shape irregularity increases the angle of repose by 6°. We repeat the test under different gravitational acceleration ranging from 0.1 to 25 m/s2 and show that for values below about 10 m/s2, the angle of repose is inversely related to the gravity but above 10 m/s2, remains independent of the gravity. We perform triaxial compression tests to investigate behaviors of simulated samples under confined loadings. The confinement varies from zero to 15 kPa, corresponding to the lateral in situ stress at depths up to 250 cm. The cohesion and friction angle derived from the triaxial tests are shown to agree with the lab and in situ measurements. This numerical practice and presented methodology pave the way for full‐scale simulation of mining operations on the Moon surface.

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“…It is based on the discrete element method, often used for rocks or soils modelling [18]. It reveals to be an interesting way to model the mechanical behavior of brittle materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Discrete Element Modelling of Composite Hollow Spheres Subjected to Dynamic Fracture

Coré

Kopp

Viot

et al. 2017

International Journal of Polymer Science

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This paper deals with the characterization and the numerical modelling of the collapse of composite hollow spherical structures developed to absorb energy during high velocity impacts. The structure is composed of hollow spheres ( = 2-30 mm) made of epoxy resin and mineral powder. First of all, quasi-static and dynamic (V = 5 mm⋅min −1 to V = 2 m⋅s −1 ) compression tests are conducted at room temperature on a single sphere to study energy dissipation mechanisms. Fracture of the material appears to be predominant. A numerical model based on the discrete element method is investigated to simulate the single sphere crushing. The stress-strain-time relationship of the material based on the Ree-Eyring law is numerically implemented. The DEM modelling takes naturally into account the dynamic fracture and the crack path computed is close to the one observed experimentally in uniaxial compression. Eventually, high velocity impacts (V > 100 m⋅s −1 ) of a hollow sphere on a rigid surface are conducted with an air cannon. The numerical results are in good agreement with the experimental data and demonstrate the ability of the present model to correctly describe the mechanical behavior of brittle materials at high strain rate.

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3D DEM Simulation of Crushable Granular Soils under Plane Strain Compression Condition

Cited by 16 publications

References 13 publications

A peridynamic investigation on crushing of sand particles

A peridynamic investigation on crushing of sand particles

Simulation of Lunar Soil With Irregularly Shaped, Crushable Grains: Effects of Grain Shapes on the Mechanical Behaviors

Experimental Investigation and Discrete Element Modelling of Composite Hollow Spheres Subjected to Dynamic Fracture

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