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The Discrete Element Method (DEM) was used to simulate soil and tillage tool interaction. A frictional-cohesive model was implemented in DEMeter++ software using the Mohr-Coulomb criteria of soil failure. The model parameters were defined based on the mechanical properties of an Oxisol soil from Cuba Island. The soil mechanical properties called Young’s Modulus, Poisson’s ratio, cohesion, internal friction, soil-metal friction, and adhesion were obtained by triaxial compression tests and modified shear tests of remoulded soil samples. The mechanical properties above defined were obtained at a different content of water (w = 16 to 32%) and dry bulk density (dd = 1 to1.4 g/cm3) for a total of 15 experimental points from a multifactorial experimental design. By regression analysis, a set of statistical equations was applied to initialize the values of the soil macro-properties in the DEM model. The inter-particle bond was a result of the combination between cohesion and friction forces at the particle scale. The soil calibration was performed finding the macro-micro relationship of friction and cohesion parameters. As a result, two new equations were derived to calculate these parameters for the model. A block of soils with different radii were used to evaluate the effects of particle size over force prediction during interaction between soil and a simple tool. The simulation resulted in a significant variation in force fluctuation and computational cost. Verification against analytical results from the Perumpral-Grisso-Desai model showed adequate results with respect to the simulated force. The draft and vertical forces, measured in a soil-bin were found to increase with increasing soil compaction and dry condition. The final dry bulk density showed a proportional decrease with respect to the initial one, related also with variation of the soil water content. The aggregate formation under different soil conditions called wet, medium and dry soil showed that the amount of aggregates smaller than 10 mm in medium soil condition, was larger than for the other states. The simulation of soil-bin tillage at the same conditions as in the experiment showed the model tendency of over-predicting the horizontal forces for dry-compacted soils. However, the magnitude of the error made by the model did not overcome 12%. Several applications of soil tillage were modelled using the proposed frictional-cohesive model. The effects of the subsoiler shapes were evaluated under compacted and dry soil conditions showing clear variations in forces related to the tool geometry. The addition of lateral blades in the subsoiler tool was found advantageous in terms of force per area of disrupted soil. De-compaction soil operation was simulated introducing two different sections with different densities in the virtual block of soil. The results showed the feasibility of modelling the forces demanded for the different parts of the tillage tool.

Academic collection --- 631.51 --- 631.51 Soil preparation and ploughing --- Soil preparation and ploughing --- Theses

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History --- Agricultural techniques --- 631.512 --- 631.312 --- 93 --- $?$88/1 --- 631.51 --- 63 <09> <492> --- Soil preparation and ploughing --- Ploughs --- History of agriculture--Nederland --- 63 <09> <492> History of agriculture--Nederland --- 631.312 Ploughs --- 631.51 Soil preparation and ploughing

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After giving a brief history of tillage practices and implements used throughout the world dating back to ancient times, this book goes on to describe the basic soil mechanics techniques needed to calculate the forces developed in soil by simple-shaped cutting tools. The methods of measuring soil mechanical properties, water pressure in soil and shear rate effects are touched upon. A review is given of two and three dimensional soil cutting mathematical mechanics models to predict soil cutting forces and soil volumes disturbed by cutting and tillage tools, as well as the state-of-the-art of

Tillage --- Travail du sol --- Matériel --- Equipment --- 631.51 --- Bodem : scheuren --- Bodembewerking --- Cultivation of soils --- Soil cultivation --- Soil tillage --- Tilling --- Agricultural systems --- Agriculture --- Soil management --- No-tillage --- Soil preparation and ploughing --- 631.51 Soil preparation and ploughing --- Tillage. --- Soil mechanics. --- Earthmoving machinery. --- Earth moving machinery --- Earthmovers --- Construction equipment --- Soil engineering --- Soils --- Soils (Engineering) --- Geotechnical engineering --- Mechanics --- Foundations --- Soil physics --- Sols --- Préparation.

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631.42 --- 631.51 --- 338.26 <663> --- Agricultural extension work --- -Arid regions agriculture --- -Desertification --- -631.51 Soil preparation and ploughing --- Soil preparation and ploughing --- 631.42 Soil analyses and experiments --- Soil analyses and experiments --- Aridization of land --- Desertization --- Dryland agriculture --- Dryland farming --- Extension work, Agricultural --- 338.26 <663> Economische planning. Nationale plannen. Ontwikkelingsplannen. Meerjarenplannen. Plattelandsontwikkeling. Rural development. Kosten-batenanlyse--Senegal --- Economische planning. Nationale plannen. Ontwikkelingsplannen. Meerjarenplannen. Plattelandsontwikkeling. Rural development. Kosten-batenanlyse--Senegal --- Control --- -Agricultural extension work --- Arid regions agriculture --- Desertification --- 631.51 Soil preparation and ploughing --- Climatology --- Deserts --- Agriculture --- Crop zones --- Desert reclamation --- Agricultural education --- Rural extension --- Rural development --- extension activities --- Villages --- Rural sociology --- Rural communities --- environment --- Sénégal --- Senegal --- Senegal. --- Desertification - Control - Senegal --- Arid regions agriculture - Senegal --- Agricultural extension work - Senegal --- Population paysanne --- Terroir --- Population

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Agriculture intensive --- Intensive farming --- Utilisation des terres --- land use --- Terre arable --- arable land --- Terre de pâturage --- Grazing lands --- Ressource foncière --- Land resources --- Pomme de terre --- Potatoes --- Trifolium --- Fertilité du sol --- soil fertility --- Rotation culturale --- Crop rotation --- Rendement des cultures --- Crop yield --- Belgium --- 633.491 --- 633.2 --- 633.32 --- 631.51 --- Potato. Solanum tuberosum --- Forage grasses. Meadow and pasture grasses --- Clovers. Trifolium --- Soil preparation and ploughing --- Theses --- 631.51 Soil preparation and ploughing --- 633.32 Clovers. Trifolium --- 633.2 Forage grasses. Meadow and pasture grasses --- 633.491 Potato. Solanum tuberosum --- Biotechnology