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Comparative Finite Element Analysis of the Effects of Tillage Tool Geometry on Soil Disturbance and Reaction Forces
並列摘要
In this study a comparative finite element analysis was conducted to investigate the effects of tillage tool geometry on soil disturbance and reaction forces. A nonlinear three dimensional finite element model, using ANSYS software, was developed to study the soil cutting process by trapezoidal (T_1) and rectangular (T_2) flat tools that inclined to the horizontal at three rake angles (R_1 = 30°, R_2 = 60° and R_3 = 90°), therefore a total of six treatments were considered in this analysis. The soil media was assumed as elastic-perfectly plastic material with Drucker- Prager's model. Results of this study revealed that the maximum vertical soil displaced by T_1 is greater than that of T_2; hence T_1 disturbed the soil better than T_2. Results also showed that a significant reduction in draft force was noticed when cutting the soil with T_1 in comparison to T_2. Designing the tool in the form of T_1 significantly reduces the surface area of the tool; thus conserving the engineering material.