The effect of tine geometry during vertical movement on soil penetration resistance using finite element analysis
The effect of tine geometry during vertical movement on soil penetration resistance using finite element analysis
复制标题
DOI：
10.1016/j.compag.2016.10.007
复制
发表时间：
2016-11
期刊：
影响因子：
--
通讯作者：
Changbin He;Yong You;Decheng Wang;G. Wang;Donghui Lu;John Morris Togo Kaji
中科院分区：
文献类型：
--
作者：
Changbin He;Yong You;Decheng Wang;G. Wang;Donghui Lu;John Morris Togo Kaji
保护性耕作技术的发展需要新的耕作和种植工具，以减少土壤扰动并最大限度地减少植被退化。本文试图研究尖齿几何形状在其垂直运动中对穿透阻力的影响。根据切削刃的几何形状定义了四种尖齿（即矩形、三角形、新月形和莫索系列）。研究了齿的几何形状、厚度和穿透深度对土壤穿透阻力的影响，并评估了侧面土壤扰动。采用 Drucker-Prager 弹塑性模型的有限元方法来模拟中国河北省砂壤土的材料行为。每个尖齿被视为一个离散刚体，其参考点位于中心平面的顶部中点，在此计算垂直力（穿透阻力）。结果表明，与其他尖齿相比，矩形尖齿获得了最高的穿透阻力。所有尖齿的穿透阻力随攻击表面积的增加而增加，随厚度呈非线性趋势，随穿透深度呈二次函数。侵彻过程中存在月牙形土体变形区。可以得出结论，有限元可以最大限度地了解齿几何形状对穿透阻力和土壤变形面积的影响。
New tillage and planting tools causing low soil disturbance and minimizing vegetation deterioration are desired in the conservation tillage technology development. This paper attempted to study the effect of tine geometry in its vertical movement on penetration resistance. Four kinds of tines were defined (i.e. rectangle, triangle, crescent and mososeries) based on the geometry of the cutting edge. The effects of tine geometry, thickness, and penetration depth on soil penetration resistance were investigated and side soil disturbance evaluated. Finite element method with a Drucker–Prager elasto-plastic model was introduced to simulate the material behavior of sandy loam soil taken from Hebei province in China. Each tine was considered as a discrete rigid body with a reference point at the top-midpoint of the central plane, at which the vertical force (penetration resistance) was calculated. Results indicated that the rectangle tine obtained the highest penetration resistance as compared to the others. Penetration resistances of all the tines increased with the attack surface area with a power function, nonlinear tendency with thickness and a quadratic function with penetration depth. A crescent soil deformation area existed through the penetration process. It can be concluded that the FEM can maximize the understanding of tine geometry effects on penetration resistance and soil deformation area.