论文部分内容阅读
本文以东北农业土壤为研究对象,对有限元法(Finite Element Method简称FEM)在耕作土壤中的应用进行了探讨。模拟了土壤在简单刀具切削作用下的材料非线性、几何非线性、土壤/刀具的界面作用以及滑移、裂纹等物理力学现象。建立了相应的数学模型并设计出通用的非线性有限元分析程序。电算结果提供了关于土壤的阻力、应力场、位移场、破坏区域、土核以及刀具表面应力分布等问题的详细资料。同时做了各种切削角度的室内切土试验。在前述很多项目上,FEM预测值与实测结果或前人研究结论表现了良好的一致性。表明FEM将为耕作土力学的研究及耕耘工具性能的预测提供一个严格定量分析的适用的理论解决方法。
In this paper, agricultural soil in Northeast China as the research object, the application of Finite Element Method (FEM) in tillage soil was discussed. The soil non-linearity, geometric nonlinearity, soil / tool interface and the physical and mechanical phenomena such as slippage and crack were simulated under the action of simple cutting tool. Established the corresponding mathematical model and designed a general non-linear finite element analysis program. The calculation results provide detailed information on soil resistance, stress field, displacement field, failure area, soil core and tool surface stress distribution. At the same time doing a variety of cutting point of indoor soil cut test. On many of the aforementioned items, FEM predictions showed good agreement with measured or previous findings. It shows that FEM will provide a rigorous and quantitative analysis of the applicable theoretical solutions for the study of soil mechanics and the prediction of tilling tools performance.