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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 (T2) flat tools that inclined to the horizontal at three rake angles (R 1 = 30°, R2 = 60° and R3 = 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 T2; hence T1 disturbed the soil better than T2. Results also showed that a significant reduction in draft force was noticed when cutting the soil with T 1 in comparison to T2. Designing the tool in the form of T 1 significantly reduces the surface area of the tool; thus conserving the engineering material.

Comparative Finite Element Analysis of the Effects of Tillage Tool Geometry on Soil Disturbance and Reaction Forces