DEM modeling of cone penetration and unconfined compression in cohesive solids

Janda, Álvaro; Ooi, Jin Y.

doi:10.1016/j.powtec.2015.05.034

Cited by 69 publications

(34 citation statements)

References 30 publications

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“…After the primary compression, the plate was removed and the DEM simulation was run for a few seconds at small time step (1eÀ07 s) until the particle assembly reached a stable state and the desired initial bulk density. After the particles assembly was stable the ratio of particle kinetic energy to potential energy was found to be 2eÀ08, a low value assumed to be stable similar to other works (Janda and Ooi, 2016). The initial bulk density after stable DEM soil particle assembly for the 5 mm and 10 mm was 1308 kg/m 3 (close to the laboratory measured soil bulk density of 1307 kg/m 3 and standard deviation of 25 kg/m 3 ).…”

Section: Dem Simulation For Particle Size Selectionsupporting

confidence: 84%

“…The total number of soil particles in the soil box were 274,494 and 36,432 with 5 mm and 10 mm diameter particles, respectively. Many studies used different approaches to select DEM particle size and determine the appropriate boundary (wall) to median DEM particle size ratio to simulate a cone penetrometer to soil interaction (Jiang et al, 2006;Falagush et al, 2015, Janda andOoi, 2016;and Syed et al, 2017). In those studies, range of Fig.…”

Section: Dem Simulation For Particle Size Selectionmentioning

confidence: 99%

“…(For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.) boundary to median particle size (B/d 50 ) from 1.8 to 3.0 ensured a cone penetrometer tip always in contact with DEM particles during penetration and seemed to produce the desired soil penetration resistance (Jiang et al, 2006;Falagush et al, 2015, Janda andOoi, 2016;and Syed et al, 2017). For the simulation of blade-to-soil interaction for DEM particle size selection, the ratio of tool depth (d) of 38 mm to DEM particle size of 5 mm and 10 mm before soil surcharge build up in front of the blade were 7.62 and 3.81, respectively, that created more particles to interact to the blade within the tool depth and width than the previous cone penetrometer to soil interaction studies.…”

Section: Dem Simulation For Particle Size Selectionmentioning

confidence: 99%

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Discrete element modeling of cultivator sweep-to-soil interaction: Worn and hardened edges effects on soil-tool forces and soil flow

Tekeste

Balvanz²,

Hatfield

et al. 2019

Journal of Terramechanics

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Simulation of tool-to-soil interaction provides opportunities to accelerate new equipment design and evaluate performance of tillage tools. Simulation based evaluation of worn tillage tools performance on soil flow has not been done. Discrete Element Modelling (DEM) has a potential to simulate worn tool to soil interaction problems, where worn tools CAD can be generated using 3D scanning. The DEM parameters of Hertz-Mindlin with Parallel Bond model were calibrated to match draft force and soil failure zone measured from a tool bar moving at 0.22 m/s and 38 mm cutting depth. The draft force and soil forward failure zone were predicted at 7% and 24% relative errors compared to measured values, respectively. Using the optimized DEM soil model, the interaction of three 3D reconstructed sweeps (new sweep, carbide treated-worn, untreatedworn) with soil were simulated to compare their geometric wear dimensional loss, performance on soil forces and soil flow. Results showed that the carbide treated-worn sweep had similar soil draft force and soil forward failure distance as the new sweep. The untreated-worn sweep showed lower vertical force (less suction) and its wing induced soil failure zone (front and lateral) showed poor soil tilth quality compared with the carbide treated-worn sweep and the new sweep.

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Section: Dem Simulation For Particle Size Selectionsupporting

confidence: 84%

Section: Dem Simulation For Particle Size Selectionmentioning

confidence: 99%

Section: Dem Simulation For Particle Size Selectionmentioning

confidence: 99%

See 1 more Smart Citation

Discrete element modeling of cultivator sweep-to-soil interaction: Worn and hardened edges effects on soil-tool forces and soil flow

Tekeste

Balvanz²,

Hatfield

et al. 2019

Journal of Terramechanics

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“…At the beginning of the penetration, the average resistance force on the nose of projectile increases linearly with the penetration distance due to the developing of the contact zone between projectile and target. Once the nose of projectile is completely into the target the penetration reaches a steady state that results in approaching constant value of the penetration resistance [16]. In other words the state of penetration for the projectile at some speed can be represented by the limiting penetration resistance correspondingly.…”

Section: Force History Of the Projectilementioning

confidence: 99%

Effect of Nonsmooth Nose Surface of the Projectile on Penetration Using DEM Simulation

Han

Liu

Wang

et al. 2017

Shock and Vibration

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The nonsmooth body surface of the reptile in nature plays an important role in reduction of resistance and friction when it lives in a soil environment. To consider whether it was feasible for improving the performance of penetrating projectile we investigated the influence of the convex as one of nonsmooth surfaces for the nose of projectile. A numerical simulation study of the projectile against the concrete target was developed based on the discrete element method (DEM). The results show that the convex nose surface of the projectile is beneficial for reducing the penetration resistance greatly, which is also validated by the experiments. Compared to the traditional smooth nose structure, the main reason of difference is due to the local contact normal pressure, which increases dramatically due to the abrupt change of curvature caused by the convex at the same condition. Accordingly, the broken particles of the concrete target obtain more kinetic energy and their average radial flow velocities will drastically increase simultaneously, which is in favor of decreasing the interface friction and the compaction density of concrete target around the nose of projectile. InstructionThe penetrating problem of the projectile against geological target has already been the focus of research for a long time. It has been found that there are many factors that influence the penetration performance. The nose of the projectile, named shape function in cavity-expansion theory, could determine the impact pressure [1] and the interface friction [2] between projectile and target. Therefore, as one of the most important factors, it can affect the penetrating resistance directly.In the process of natural evolution, the reptile, such as lizard, dung beetle, and pangolin, has its special body surface morphology, which is classified into five types: groove, rib, scale, convex, and concave according to different shapes. The bionic research has discovered that these specific structures can play important roles in reducing soil resistance and friction when the reptile lives in the geological environment [3]. At present, the explanation for this above phenomenon is attributed to the following aspects [4-6].(i) When the reptile moves in the soil, the nonsmooth surface can decrease the real contact area, resulting in the reduction of friction accordingly. (ii) The nonsmooth surface of the reptile is able to change the movement pattern of the contact soil particle from sliding to rolling. Therefore, it decreases the friction force and has ability of antiwear correspondingly. (iii) The soil compacted density around the reptile could decrease because the groove and concave nonsmooth surface can hold a certain amount of the soil fragments.Inspired by the nonsmooth surface structure, the question is can it be applied to design the projectile nose to deduce the penetration resistance and abrasion? We think it is essential to research the difference of penetration caused by the convex surface.Since the discrete element method (DEM) was developed ...

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“…The discrete element method (DEM) has been used to examine the behaviour of different materials during the formation of a compact. Janda and Ooi [8] simulated the consolidation process of real soils by modelling a uniaxial confined compression. Then, they used the same model for analysing the penetration resistance of cohesive soils.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Cohesive Models in EDEM and LIGGGHTS for Simulating Powder Compaction

Ramírez-Aragón

Ordieres-Meré

Alba‐Elías

et al. 2018

Preprint

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The purpose of this work was analysing the compaction of a cohesive material using different DEM simulators to determine the equivalent contact models and identify how some parameters of the simulations affect the compaction results (maximum force and compacts appearance) and computational costs. For that purpose, three cohesion contact models were tested (‘linear cohesion’ in EDEM; ‘SJKR’ and ‘SJKR2’ in LIGGGHTS). The influence of the particle size distribution (PSD) on the results was also investigated. Further assessments were performed on the effect of selecting different timesteps, using distinct conversion tolerances for exporting the 3D models to STL files and moving the punch with different speeds. Consequently, it was possible to determine that a timestep equal to a 10% Rayleigh timestep, a conversion tolerance of 0.01 mm and a punch speed of 0.2 m/s are adequate for simulating the compaction process using the contact models in this work. In addition, the results determined that the maximum force was influenced by the PSD because of the rearrangement of the particles. The PSD was also related to the computational cost because of the number of simulated particles and their sizes. Finally, an equivalence was found between the linear cohesion and SJKR2 contact models

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DEM modeling of cone penetration and unconfined compression in cohesive solids

Cited by 69 publications

References 30 publications

Discrete element modeling of cultivator sweep-to-soil interaction: Worn and hardened edges effects on soil-tool forces and soil flow

Discrete element modeling of cultivator sweep-to-soil interaction: Worn and hardened edges effects on soil-tool forces and soil flow

Effect of Nonsmooth Nose Surface of the Projectile on Penetration Using DEM Simulation

Comparison of Cohesive Models in EDEM and LIGGGHTS for Simulating Powder Compaction

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