天津港区硬质黏土切削过程的有限元模拟

硬质黏土的挖掘存在效率低的问题,需要研究该种土质的切削机理.利用数值模拟技术,建立刀齿切削硬质黏土的三维分析模型.土体的本构模型采用非线性弹塑性模型,应用单元损伤失效准则模拟硬质黏土的切屑,并基于显式积分算法实现了硬质黏土全物理过程的数值仿真,分析不同时刻的土体变形状态,得到刀齿的切削荷载.结果表明,对于所选定的硬质黏...

Finite element simulation for cutting process of hard clay in Tianjin Port area

Aiming at the problem of the low efficiency of hard clay excavation,it is necessary to study the cutting mechanism of the clay.By using the method of numerical simulation,we establish the 3D model of cutting hard clay by cutter tooth,build the soil constitutive model by the nonlinear elastoplastic model,realize the numerical simulation of hard clay physical process based on the explicit integral algorithm and chip simulation unit damage failure criterion of hard clay,analyze the status of soil deformation in different times,and obtain the cutting force of the tooth.The results show that as the selected hard clay parameters,when the selected cutting thicknesses are 50mm,100mm and 150mm,the errors of numerical simulation and cutting experiment are 27%,9%and 5%respectively.Considering the inhomogeneity of soil,it is suggested to express the cutting load with the peak value of cutting force obtained from numerical simulation.