Abstract
Soil tillage resistance poses an ongoing challenge to researchers and designers. This article aims to provide a prediction method for the resistance of soil to failure created by the shank-type tillage tine with chamfers. Prediction functions expressed using the soil shear strength (τ), unconfined compression strength (σ), friction coefficient (μ), cutting angle (γ), and soil-tool interface area (A) were constructed. Validation experiments were conducted in a soil bin by using a test bench which moved the tine through the soil. Six shank-type narrow tillage tines with different geometrical structure parameters were designed, and operated in a compacted sandy loam using various tillage working depths. The results revealed that the draft force prediction model successfully predicted the draft force with the prediction accuracy of 39–92%. The experimental data showed that exponential function relationships exist between the draft force, working depth, and soil-tine interface area, with the coefficients of determination R2 exceeding 0.97. The draft force increased linearly with the rake angle and tine thickness. Prediction models well described the changing tendency of the draft force with the geometrical structure parameters and working depth. We suggest further research on the soil failure mechanism caused by the shank-type tillage tine with chamfers and related soil disturbance to improve the prediction accuracy, and the applicability in different types of soil.
Published Version
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