The cutting of soil by narrow blades

McKyes, E.; Ali, Olivier

doi:10.1016/0022-4898(77)90001-5

Cited by 161 publications

(72 citation statements)

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“…The analytical approaches were based on the lateral earth pressure theory. They achieved some original empirical findings that were validated experimentally (McKyes & Ali, 1977;McKyes & Desir, 1984;Gupta et al, 1989;Tong & Moayad, 2006).…”

Section: Introductionmentioning

confidence: 98%

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: 98%

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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“…In our analyses of sample trenches and surface-bearing tests for angles of internal friction, we have used a theoretical model for plowing by narrow blades in soil (McKyes and Ali, 1977). Results from these analyses are outlined in a general way in this section.…”

Section: Physical Properties Of Surface Materials At Viking Landing Smentioning

confidence: 99%

“…Apparent and probable cohesions of blocky material and expected horizontal forces for sand -----------56 Estimated angles of internal friction of cloddy material from data on sample trenches, Lander 2 ---------59 Cohesion of crusty to cloddy material as a function of angle of internal friction, using the model of McKyes and Ali (1977),…”

Section: ---------------------------------------------12 Locations Anmentioning

confidence: 99%

Physical properties of the surface materials at the Viking landing sites on Mars

Moore¹,

Hutton²,

Clow³

et al. 1987

Professional Paper

119

181

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This full-scale model with fully operational lander cameras and surface-sampler subsystem was installed adjacent to a large sand box representing the area in reach of the surface sampler. The Science Test Lander was used during the mission to develop and verify surface-sampler commands and to perform some experiments for the Physical Properties Investigation. CircularS-band radio antenna of lander is 0.76 m wide. Locations of spacecraft parts, cameras, and surface-sampler subsystem are shown in figures 1 and 3. PHYSICAL PROPERTIES OF THE SURFACE MATERIALS AT CONTENTS i\bstract ---------------------------Introduction--------------------------Viking missions ----------------------Supplemental sections-------------------i\cknowledgments---------------------Mission description and conventions -------------Viking lander -----------------------Spacecraft parts ---------------------Surface-sampler subsystem ----------------Mission operations --------------------Other Viking experiments and investigations -------Coordinate systems and measurements ----------Time --------·_ ------------------Sample-field definition ------------------The landing sites ----·-------------------Orbiter views -----------------------Lander panoramas --------------------Sample fields -----------------------Landing ---'-------------------------I>escent -----------------------~ --Touchdown ------------------------Lander 1 ----------------------Lander 2 ----------------------I>iscussion ---------------------- exhaust erosion ------------------35 Surface-sampler data ---------------------44 i\ctivities -------------------------46 Sample trenches ---------------------48 I>rift material --------------------48 Blocky material -------------------52 Crusty to cloddy material --------------56 I>iscussion ----------------------58 Surface-bearing tests -------------------63 I>rift material --------------------63 Blocky material -------------------66 Crusty to cloddy material --------------68 · Backhoe touchdowns -------------------70 Surface impacts ----------------------77 Slope stability-------------------------81 Trench walls -----------------------81 XRFS 1 trench -------------------82 Physical Properties 1 trench ------------. 82 I>eep Hole 1 ---------------------84 Inferred cohesions------------------84 Natural slopes-----------------------84 Conical piles and tailings -----------------88 Summary -------------------------88 The quest for rocks ----------------------88 Sample acquisitions --------------------90 Purges and rock piles -------------------91 Comminution -----------------------92 Rock pushing -----------------------99 Summary -------------------------101 Temperatures -------------------------101 Surface-sampler diurnal temperatures-----------102 Lander 1 ----------------------102 Lander 2 ----------------------103 Interim period ----------------------104I>iscussion----------------------. :. . . --104 Page Visual observations of changes ----------------105 Conical piles------------------------106 Materials in the footpads ----------------...

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“…The analysis of the soil rupture is based on the passive earth pressure theory, which has successfully been used to predict the bulldozing force [21,22]. According to the shape and cutting rake angle of the blade, different cutting models have been proposed to describe the soil rupture mechanism [23][24][25][26]. These theories can be used as a fundamental reference for modeling drill-tool interaction.…”

Section: Introductionmentioning

confidence: 99%

On Modeling Drilling Load in Lunar Regolith Simulant

Quan

Chen

Deng

et al. 2018

Chin. J. Mech. Eng.

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Drilling and coring, as effective ways to obtain lunar regolith along the longitudinal direction, are widely applied in the lunar sampling field. Conventionally, modeling of drill-soil interaction was divided into soil cutting and screw conveyance processes, ignoring the differences in soil mechanical properties between them. To improve the modeling accuracy, a hypothesis that divides the drill-soil interaction into four parts: cuttings screw conveyance, cuttings extruding, cuttings bulldozing, and in situ simulant cutting, is proposed to establish a novel model based on the passive earth pressure theory. An iterative numerical calculation method is developed to predict the drilling loads. A drilling and coring testbed is developed to conduct experimental tests. Drilling experiments indicate that the drilling loads calculated by the proposed model match well the experimental results. The proposed research provides the instructions to adopt a suitable drilling strategy to match the rotary and penetrating motions, to increase the safety and reliability of drilling control in lunar sampling missions.

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The cutting of soil by narrow blades

Cited by 161 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

Physical properties of the surface materials at the Viking landing sites on Mars

On Modeling Drilling Load in Lunar Regolith Simulant

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