Izvorni znanstveni članak
Development and Experimental Testing of a FEM Model for the Stress Distribution Analysis in Agricultural Soil due to Artificial Compaction
Sorin-Ştefan Biriş
; Politehnica University of Bucharest, Faculty of Biotechnical Systems Engineering, Department of Biotechnical Systems, Splaiul Independentei 313, 060042, Bucharest, Romania
Valentin Vlăduţ
; National Institute of Research-Development for Machines and Installations Designed for Agriculture and Food Industry – INMA, Str. Ion Ionescu de la Brad., No. 6, S. 1, Bucharest, Romania
Nicoleta Ungureanu
; Politehnica University of Bucharest, Faculty of Biotechnical Systems Engineering, Department of Biotechnical Systems, Splaiul Independentei 313, 060042, Bucharest, Romania
Gigel Paraschiv
; Politehnica University of Bucharest, Faculty of Biotechnical Systems Engineering, Department of Biotechnical Systems, Splaiul Independentei 313, 060042, Bucharest, Romania
Gheorghe Voicu
; Politehnica University of Bucharest, Faculty of Biotechnical Systems Engineering, Department of Biotechnical Systems, Splaiul Independentei 313, 060042, Bucharest, Romania
Sažetak
It is known that the compaction phenomenon of agricultural soil can be defined as an increase in its dry density, respectively as in reduction of its porosity, and it can result from any natural causes as: rainfall impact, soaking, internal water stress from soil, and other. An important role has the artificial compaction, which is generated by the contact with tyres or caterpillars of tractors and agricultural machines. In present, one of the most advanced methods for modelling the phenomenon of stresses propagation in agricultural soil is the Finite Element Method (FEM), which is a numerical method for obtaining approximate solutions of ordinary and partial differential equations of this distribution. In this paper, the soil has been idealised as an elastic-plastic material by Drucker- Prager yield criteria. This paper presents a model for prediction of the stress state in agricultural soil below agricultural tyres in the driving direction and perpendicular to the driving direction, which are different from one another, using the Finite Element Method. General model of analysis was created using FEM, which allows the analysis of equivalent stress distribution and the total displacements distribution in the soil volume, making evident both of the conditions in which the soil compaction is favour and of the study of graphic variation of equivalent stress and the study of shifting in the depth of the soil volume. Using an acquisition data system and pressure sensors, the theoretical model was experimentally checked in the laboratory.
Ključne riječi
soil compaction; finite element method; stress state; tractor; tyre
Hrčak ID:
35766
URI
Datum izdavanja:
26.3.2009.
Posjeta: 1.619 *