Dynamic modeling of soil–tool interaction: An overview from a fluid flow perspective

Karmakar, S.; Kushwaha, R. L.

doi:10.1016/j.jterra.2005.05.001

Cited by 73 publications

(52 citation statements)

References 35 publications

(35 reference statements)

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“…The analytical methods discussed here, are based on passive earth pressure theory and assumptions of a preliminary soil failure pattern [1]. Dynamic effects, complicated tool geometry and large deformations can not be modelled using these methods.…”

Section: Methodsmentioning

confidence: 99%

“…The simplest form of soil cutting or tillage is that of a flat blade moving through the soil. Karmakar [1] summarises the different approaches used to model soil cutting. Six major methods can be identified, namely empirical/semi-empirical, dimensional analysis, Finite Element Methods (fem), Discrete Element Methods (dem), Artificial Neural Networks (ann) and Computational Fluid Dynamics (cfd).…”

Section: Introductionmentioning

confidence: 99%

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Discrete and continuum modelling of soil cutting

Coetzee

2014

Comp. Part. Mech.

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Both continuum and discrete methods are used to investigate the soil cutting process. The Discrete Element Method (dem) is used for the discrete modelling and the Material-Point Method (mpm) is used for continuum modelling. Mpmis a so-called particle method or meshless finite element method. Standard finite element methods have difficulty in modelling the entire cutting process due to large displacements and deformation of the mesh. The use of meshless methods overcomes this problem. Mpm can model large deformations, frictional contact at the soil-tool interface, and dynamic effects (inertia forces). In granular materials the discreteness of the system is often important and rotational degrees of freedom are active, which might require enhanced theoretical approaches like polar continua. In polar continuum theories, the material points are considered to possess orientations. A material point has three degrees-of-freedom for rigid rotations, in addition to the three classic translational degrees-of-freedom. The Cosserat continuum is the most transparent and straightforward extension of the nonpolar (classic) continuum. Two-dimensional dem and mpm (polar and nonpolar) simulations of the cutting problem are compared to experiments. The drag force and flow patterns are compared using cohesionless corn grains as material. The corn macro (continuum) and micro (dem) properties were obtained from shear and oedometer tests. Results show that the dilatancy angle plays a significant role in the flow of material but has less of an influence on the draft force. Nonpolar mpm is the most accurate in predicting blade forces, blade-soil interface stresses and the position and orientation of shear bands. Polar mpm fails in predicting the orientation of the shear band, but is less sensitive to mesh size and mesh ori-C. J. Coetzee (B) Department of Mechanical and Mechatronic Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa e-mail: ccoetzee@sun.ac.za entation compared to nonpolar mpm. dem simulations show less material dilation than observed during experiments.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Discrete and continuum modelling of soil cutting

Coetzee

2014

Comp. Part. Mech.

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“…A better understanding of soil-tool interface can be obtained by correlating the rheological behavior of soil with its dynamic features, and the disruption of the soil will depend on the geometry of the tool, operating speed and soil physical properties (KARMAKAR & KUSHWAHA, 2006).…”

Section: Introductionmentioning

confidence: 99%

Characterization of soil parameters of two soils of Rio Grande do Sul in modeling the prediction of tractive effort

Machado

Trein

2013

Eng. Agríc.

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ABSTRACT:The interaction between the soil and tillage tool can be examined using different parameters for the soil and the tool. Among the soil parameters are the shear stress, cohesion, internal friction angle of the soil and the pre-compression stress. The tool parameters are mainly the tool geometry and depth of operation. Regarding to the soils of Rio Grande do Sul there are hardly any studies and evaluations of the parameters that have importance in the use of mathematical models to predict tensile loads. The objective was to obtain parameters related to the soils of Rio Grande do Sul, which are used in soil-tool analysis, more specifically on mathematical models that allow the calculation of tractive effort for symmetric and narrow tools. Two of the main soils of Rio Grande do Sul, an Albaqualf and a Paleudult were studied. Equations that relate the cohesion, internal friction angle of the soil, adhesion, soil-tool friction angle and pre-compression stress as a function of water content in the soil were obtained, leading to important information for use of mathematical models for tractive effort calculation. KEYWORDS:Soil cohesion, soil-tool adhesion, pre-compression stress. CARACTERIZAÇÃO DOS PARÂMETROS DE SOLOS DO RIO GRANDE DO

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“…The equations developed to predict traction efforts of narrow tools are based on rectangular models (GODWIN & O´DOGHERTY, 2007). KARMAKAR & KUSHWAHA (2006) point out that a better understanding of soil-tool interaction is obtained by correlating soil rheological behavior with its dynamic features, and mathematical solutions based on empirical and semi-empirical models were developed to describe this interaction. MANUWA & ADEMOSUN (2007), CONTE et al (2008) and MANUWA (2009, note that the geometric aspects and the water content of the soil determine the tractive effort produced by narrow tillage tools, and that the ratio width/depth of the tool should be considered when going to the design of the equipment.…”

Section: Introductionmentioning

confidence: 99%

Draft prediction models for soil engaging tines in two soils of Rio Grande do Sul, Brazil

Machado

Trein

2013

Eng. Agríc.

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ABSTRACT:The draft forces of soil engaging tines and theoretical analysis compared to existing mathematical models, have yet not been studied in Rio Grande do Sul soils. From the existing models, those which can get the closest fitting draft forces to real measure on field have been established for two of Rio Grande do Sul soils. An Albaqualf and a Paleudult were evaluated. From the studied models, those suggested by Reece, so called "Universal Earthmoving Equation", Hettiaratchi and Reece, and Godwin and Spoor were the best fitting ones, comparing the calculated results with those measured "in situ". Allowing for the less complexity of Reece's model, it is suggested that this model should be used for modeling draft forces prediction for narrow tines in Albaqualf and Paleudut.

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Dynamic modeling of soil–tool interaction: An overview from a fluid flow perspective

Cited by 73 publications

References 35 publications

Discrete and continuum modelling of soil cutting

Discrete and continuum modelling of soil cutting

Characterization of soil parameters of two soils of Rio Grande do Sul in modeling the prediction of tractive effort

Draft prediction models for soil engaging tines in two soils of Rio Grande do Sul, Brazil

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