Trafficability of Wheels on Farm Lands with Hard Pan (Two-Layer Soil)

车轮在硬盘农田（双层土）上的通过性

基本信息

批准号：
62460210
负责人：
INOUE Eiji
金额：
$ 3.2万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1989
项目状态：
已结题

项目摘要

1) The non-vertical penetration test apparatus was developed, which enables us to alter a penetration angle from 90 (vertical) to 30 degrees in every 15 degree and a depth of soil layer. By the use of this apparatus the vertical and horizontal soil reaction with variations of a penetration angle and a depth of soil were measured. Besides, the soil reaction for the vertical penetration was analyzed by the slip-line method. The good coincidence of the experimental and the analytical results was attained.2) The test apparatus for traveling performance was developed, in which the wheel-system is connected with the carriage through a linear bearing system so that it does not incline and the contact load is kept constant even when a sinkage changes. Further, the T-shaped sensors are attached to the wheel surface in order to measure distributions of a normal and tangential stress.3) A new method for measuring soil deformation was developed: A few hundred markers, the diameter of which is 5mm … More and which are printed a black cross, are fitted on the inside wall of an acryl plate by water in appropriate intervals and move with a movement of soil particles.4) The subloading surface model was extended so as to describe the induced anisotropy which proceeds with the deformation of soil for a large slippage.5) Introducing the subloading surface model, the programming of the finite element method for elastoplastic deformation was developed. In this program the boundary condition in the contact surface between a wheel and soil was improved so as to slip satisfying the Coulomb friction. Further, the controlling program for keeping the contact load constant was incorporated, by which the sinkage with a slip became able to be analyzed.6) By the use of the finite element program the numerical calculation was per formed under the same conditions as those in the experiments. The analytical results express well the trends of experiments for the net traction, the axle-torque, the normal and tangential stress on wheel surface and the deformation of soil. Less

1）开发了非垂直渗透测试，使我们能够通过使用垂直和水平的土壤反应来改变土壤叶的深度 - 实现实验和分析结果的良好重合。即使下沉式变化，也可以在侧面上固定在车轮表面上。丙烯板通过适当的含量和移动颗粒移动。4）延长升降的del延长了，以描述诱导的各向异性，该诱导的各向异性以较大的滑动的土壤变形进行。5）引入表面模型，有限元元素弹性变形的方法。元素程序在与实验相同的条件下渗透了分析结果