Simulation of a soil loosening process by means of the modified distinct element method

Momozu, M.; Oida, Akira; Yamazaki, Minoru; Koolen, A.J.

doi:10.1016/s0022-4898(03)00011-9

Cited by 47 publications

(18 citation statements)

References 2 publications

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“…The contact force is also determined by the particle properties (e.g. stiffness) and the overlap between the granules in contact (Momozu et al, 2003;Shmulevich et al, 2007;Franco et al, 2007;Obermayr et al, 2011;Chen et al, 2013). For CFD the tool is considered to be stationary and the soil (visco-plastic fluid) was displaced around the tool.…”

Section: Introductionmentioning

confidence: 99%

Soil-blade orientation effect on tillage forces determined by 3D finite element models

Ibrahmi

Bentaher

Maalej

2014

Span. j. agric. res.

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This paper investigated the effect of the cutting parameters of a blade on the tillage force components using finite element modeling. A three-dimensional model was carried out with Abaqus Explicit in order to study the interaction between the tool and soil. The soil was modeled with linear forms of the Drucker-Pager model, while the tool was considered as a rigid body with a reference point taken at its tip. The effect of tillage depth and the width of a vertical blade were studied. It was found that the amounts of the draught and vertical forces increase linearly with a slope of 0.037 and 0.0143 respectively when the width increases. The narrow tool (width < 60mm) has a greater effect on the specific draught force than a larger tool. Draught and specific draught force increase with polynomial and linear curve respectively versus the depth. However, this effect was reduced for the vertical force. These results were in a good agreement with previously published works. The second part of this paper is focused on the oblique position of the blade to evaluate the effect of the attack angles on both the tillage forces (draught, lateral and vertical) and the cutting process of the soil during and after its failure. For all considered angles, the draught force presents the highest values compared to the vertical and lateral forces. Results showed that working with small cutting and an average rake angles (30°to 60°and 45°respectively) can produce a good soil inversion.Additional key words: FEM; oblique blade; force; attack angles.* Corresponding author: ayadi.ibrahmi@yahoo.fr; ayadiibrahmi@hotmail.fr Received: 16-02-14. Accepted: 10-10-14.Abbreviations used: CFD (computational fluid dynamics); DEM (discrete element method); FEM (finite element method); RF (reaction force); RF2 (vertical force); RF3 (draught force); α (cutting angle); θ (rake angle).

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Section: Introductionmentioning

confidence: 99%

Soil-blade orientation effect on tillage forces determined by 3D finite element models

Ibrahmi

Bentaher

Maalej

2014

Span. j. agric. res.

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“…A few researchers have already discussed the general concept of DEM while describing the soil-tool interaction (Asaf et al, 2006;Asaf et al, 2007;Mak et al, 2012). Soil-tool interaction studies were extensively carried out for both non-agricultural (Franco et al, 2005;Momozu et al, 2003) and agricultural applications (Asaf et al, 2007). So far, it was reported that the DEM is a useful tool for the study of unsaturated soils (Wulfsohn et al, 1994;van der Linde, 2007).…”

Section: Introductionmentioning

confidence: 99%

Modelling soil–sweep interaction with discrete element method

Kismányoky

Jóri

Mouazen

2013

Soil and Tillage Research

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Several analytical methods of the soil-tool interaction have been developed and tested, but they are time consuming and require large effort, which has prevented their widespread use. This paper presents the development of a three dimensional (3-D) discrete element method (DEM) model for the simulation of soil-sweep interaction. The aim was to understand the effects of the sweep rake angle (β) and speed on draught and soil loosening. It implements computer aided design (CAD) systems to simulate the sweep geometry. The DEM model output was validated by comparing simulated and corresponding actual soil bin measurements using a cohesive wet sandy soil. Cohesion of the wet sandy soil was assigned using a parallel bond contact model, where the normal and shear stiffness of the bond, the normal and shear strength, and the size of the connecting geometry were the main parameters. Following the comparison between the simulated and measured draught based on input parameters measured with a direct shear box test, virtual DEM triaxial compression analyses were performed to refine the DEM model parameters including cohesion, internal friction angle, modulus of elasticity and Poisson's ratio, using the Mohr-Coulomb failure criterion.

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“…In DEM the medium is considered as an assembly of discrete particles connected through a spring to represent the elastic/in-elastic properties of the medium. DEM has been used to model soil cutting by different tools and cutting conditions [19][20][21][22][23]. DEM analyses are generally limited to small scale studies.…”

Section: Formation Resistive Forcesmentioning

confidence: 99%

Cable Shovel Stress & Fatigue Failure Modeling - Causes and Solution Strategies Review

Raza

Frimpong²

2013

J Powder Metall Min

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Simulation of a soil loosening process by means of the modified distinct element method

Cited by 47 publications

References 2 publications

Soil-blade orientation effect on tillage forces determined by 3D finite element models

Soil-blade orientation effect on tillage forces determined by 3D finite element models

Modelling soil–sweep interaction with discrete element method

Cable Shovel Stress & Fatigue Failure Modeling - Causes and Solution Strategies Review

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