Three-dimensional discrete element modelling of tillage: Determination of a suitable contact model and parameters for a cohesionless soil

Üçgül, Mustafa; Fielke, John M.; Saunders, Chris

doi:10.1016/j.biosystemseng.2014.02.005

Cited by 182 publications

(86 citation statements)

References 37 publications

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“…Indeed, several previous scientists tried to find out whether the plasticity theory is applicable to soil mechanics in both civil engineering and tillage (Zhang, 1993;Li, 2004). A number of criteria like Mohr-Coulomb, Drucker-Prager and Cam-Clay have been used for the simulation of problems in soil mechanics (Bose & Som, 1998;Fielke, 1999;Mouazen & Nemenyi, 1999;Ucgul et al, 2014).…”

Section: Soil Modelmentioning

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: Soil Modelmentioning

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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“…31 Different modeling methods have been used to model the soil-implement interaction during the tillage process. Studies of the soil-tool interaction have focused on developing force prediction models by using different types of soil, tools, and operating conditions (depth of operation, tool direction, tool geometry, etc.).…”

Section: Finite Element Formulationmentioning

confidence: 99%

Bioinspired design of a ridging shovel with anti-adhesive and drag reducing

Zhang

Sun

2015

Advances in Mechanical Engineering

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Learning from the microstructure of the convex (concave) and ridging (triangle and arc-shaped) shapes of fresh lotus leaves and shark skin, bionic ridging shovels was designed with the characteristics of adhesion and resistance reduction. Ten ridging shovel models were established, and the interaction process with the soil by ANSYS is discussed. Stress analysis results showed that the bionic ridging shovel was more obvious in visbreaking and in the resistance reduction effect. An indoor soil bin experiment with the bionic ridging shovel and the prototype ridging shovel was operated as follows: the ridging resistance of the three types of ridging shovel was tested under the condition of two soil moistures (18.61% and 20.9%) and three different ridging speeds (0.68, 0.87, and 1.11 m/s). In this article, the structure, the mechanism, and their relationship to the functions are discussed. The results of this study will be useful in practical application in the field of agricultural machinery toward practical use and industrialization.

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“…The calculated results show a good match with the authors' results described in their earlier work (Fielke, 1988). In their subsequent research, Ucgul et al (2014) also modeled plastic deformations. They proved that increasing particle size does not significantly impair the accuracy of the DEM method and significantly reduces computation time when using larger particle sizes.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Soil Water Content in the Soil-Tool DEM Model

Kismányoky

Jóri

2015

Progress in Agricultural Engineering Sciences

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Abstract. The Discrete Element Method (DEM) for describing the action mechanism between soil and sweep tool can be used to perform a detailed analysis of draft force, soil cutting, clod-crushing and loosening by taking into account the tillage speed and the three soil phases. This study describes the simulation of the 3D DEM soil model and a cultivator sweep digitized with a 3D scanner, showing the soil-sweep interaction as a function of implement draft force and implement operating speed.The suitability of the model is validated by comparing the results of laboratory and simulated shear tests (static validation) with the results of soil bin tests (dynamic validation). The mechanical parameters of the sandy soil used for the soil bin tests were measured using the direct shear box test. Cohesion for the soil model used during simulations was set using the parallel bond contact model, where the determining factors were the Young modulus for particle contact (E c ) and bonding (Ē c ), the Poisson's ratio (nu), the normal ( ) σ and shear ( ) τ bond strength and the radius of the related volume (cylinder). Once the DEM model parameters were set, the draft force values measured during dynamic testing were harmonized using the value for viscous damping (c i ). The dynamic soil-sweep model was validated using the viscous damping applied based on the simulated and measured draft force values. The validation of the Young modulus to 0.55e6 Pa (K n = 1.73e4 N/m, K s = 8.64e3 N/m) enabled us to set the draft force values of the model for different speeds (0.8-4.1 m/s) with an accuracy of 1-4%.During the analysis of changes in tillage quality, the developed dynamic soilsweep model showed a high degree of porosity (48%) due to grubbing in the attenuated speed range (0.5-2.1 m/s), and a decreasing tendency (0.41-0.39%) in the non-damped speed range (2.1-4.1 m/s). After the initial equilibrium state, the ratio of average particle contacts for the given porosity decreased in the attenuated speed range (coord number: 4.8), and a slight decrease was also found above speeds of 2.1 m/s (coord number: 5.2). In the model, clod-crushing was examined based on the ratio of sliding contacts, and we found a continuous increase (sliding fraction: 2-15%) in the speed range used for the simulation (0.8-4.1 m/s).

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Three-dimensional discrete element modelling of tillage: Determination of a suitable contact model and parameters for a cohesionless soil

Cited by 182 publications

References 37 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

Bioinspired design of a ridging shovel with anti-adhesive and drag reducing

The Influence of the Soil Water Content in the Soil-Tool DEM Model

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