基于有限元法的耙齿土壤切削仿真

Simulation of soil cutting using rake based on FEM

针对耙吸挖泥船耙齿切削土壤的问题,提出了基于有限元的数值模拟方法。建立了耙齿和土壤的三维力学分析模型,充分考虑到土体的黏塑性并将修正的Drucker-Prager土壤模型作为土体的非线性有限元模型。利用LS-DYNA软件的动态显式算法对过程进行模拟,分析了不同切削深度以及不同切削速度下所得到的切削阻力,并通过理论方法对结果进行对比分析,验证了ALE(Arbitrary-Lagrange-Euler)算法在切削大变形问题上的可靠性,为耙齿进一步研究奠定基础。

This paper presents a numerical simulation method based on FEM for the problem of soil cutting using the rake, establishes the three dimensional analytical model for both the rake and soil, taking the visco- plasticity of soil into full consideration and using the revised Drucker-Prager model as the soil model. The simulation utilizes the dynamic explicit algorithm of LS-DYNA software to analyze the cutting resistance at different cutting velocities and depths, and compares the results with theoretical ones, which confirms that the Arbitrary-Lagrange- Euler （ALE） method can be reliable in dealing with the problem of soil tool interaction and lays a foundation for further study in the rake design.