Abstract
In this study we conducted the sensitivity analysis of the parallel bond used in the discrete element method (DEM, 3D) based soil model. We researched those parameters which simulate real soil physique attributes. In our investigations we modeled the inhomogeneity by the differentiation in particle size, the soil moisture condition by the parallel bond’s radius R, the cracking tendency by the bonding stiffnesses kn, ks and the air phase by the pore volume of the particle block. We based the validation of the simulation on the results of the simple direct shear box test which were performed in laboratory environment. We analyzed the effect of micromechanical and macromechanical parameters, used in the modeled particle block, with the use of direct shear box and triaxial shear simulations. After the recalculation of micromechanical parameters (EC, ĒC, γ) we analyzed the effect of the adjustable macromechanical parameters (kn, ks ,λ, kn, ks, σC, τC) used in the block with triaxial shear simulation. Based on the comparison of the shear simulations’ results the accuracy of the recalculation of the parallel bond’s micro-macro parameters is proved by the good correlation of the Coulomb failure criterion lines (σ-τ).
Highlights
It is important for the developing engineers of tillage machines to get fast and accurate feedback on the functionality and effectiveness of new constructions, because of the evolved market competition and the increasing needs of users
In our investigations we modeled the inhomogeneity by the differentiation in particle size, the soil moisture condition by the parallel bond’s radius R, the cracking tendency by the bonding stiffnesses k n, k s and the air phase by the pore volume of the particle block
Through our research we set our goal to iteratively tune in the mechanical parameters of the real soil and of the soil model made by the discrete particle block, throughout this procedure we investigate the correlations between the micro
Summary
It is important for the developing engineers of tillage machines to get fast and accurate feedback on the functionality and effectiveness of new constructions, because of the evolved market competition and the increasing needs of users. DEM researches until now haven’t focused on the correlations between the soil mechanical parameters measured with direct shear box test and the shear box simulations’ micromechanical and triaxial shear simulations’ macromechanical setup parameters. Sadek and his colleagues used the DEM method in their soil model. Through their investigations they validated their shear test made by the DEM method with laboratory direct shear equipment, paying particular attention to the soil moisture condition [9] Tsuji and his colleagues modeled the soil moisture condition by simulating the liquid bridges (parallel bond) between the particles and made measurements of the connection of a bulldozer blade and soil [10]. The triaxial tests are the most reliable, because tests made by using shear boxes are influenced by many parameters, for example by the shape and cross-section of the shear box, the friction between contacting geometries, etc. [11]
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