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Different meshing refinement, soil constitutive models. and soiltool friction models were examined with the commercial Finite Element Method (FEM) package ABAQUS. The Richardson extrapolation proved to be simple and reliable to determine the mesh refinement at the soil-tool interface. For a lOO-mm rigid tool. a biased mesh with 8.3-mm element length was considered more efficient. Similar forces on the tool were calculated with the Cam clay and the Hyperbolic models at a speed of 2 mls but differ by a factor of three at null speed. The Cam clay model used does not consider soil cohesion which seems an important factor at lower speeds for the highly cohesive clay soil used. Stress paths shown as the tool advance in the soil for elements located in front and below the tool tip demonstrated the ability of the Cam clay to model different loading-unloading processes of the soil. The soil-tool friction models gave similar forces and stresses on the tool for the 60° tool angle and the clay soil used but the simpler Coulombic model was faster than the Hyperbolic model by a factor of four.
C. Plouffe. M.J. Richard. C. Lague et S. Tessier 1999. ANALYSE DE SENSIBILITE AVEC LA METHODE DES ELEMENTS FINIS POUR UN PROBLEME DE TRAVAIL DU SOL EN 2-D. Canadian Agricultural Engineering 41(3):141-151.
Canadian Society for Bioengineering