模型铲刀表面的法向压力及其土壤粘附

Normal Pressure and Soil Adhesion on the Surface of Model Blade

采用模型试验法 ,利用模型铲刀和小型压力传感器对模型铲刀表面的法向压力分布规律及土壤流动、粘附情况进行了试验研究 ,拟合出模型铲刀表面法向压力的回归方程。研究结果表明 ,法向压力在模型铲刀表面呈二次曲面分布 ,在模型铲刀的中部取得最大值。法向压力的变化引起土壤变形区域的含水量发生改变 。

Adopting the method of the model experimentation, the normal pressure on the surface of model blade was measured by self regulating model blade and small pressure sensors. Based on test results, the distribution surface of normal pressure was drawn up. During the soil cutting process, the flexible destruction and adhesion of the soil on the surface of model blade was discussed. The experimental result shows that the normal pressure distribution on the surface of the model blade is a conicoid, the maximum of the normal pressure is in the middle of the model blade. It causes the change of the moisture content of soil, the decrease of tangential adhesion and sliding resistance, and the increase of normal adhesion force in the middle of the arc section of the model blade. As a result, the stuck soil is mainly distributed on the upper and lower sections of the model blade