An evaluation of chip separation criteria for the FEM simulation of machining
An evaluation of chip separation criteria for the FEM simulation of machining
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DOI：
10.1115/1.2831066
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发表时间：
1996-11-01
影响因子：
4
通讯作者：
Black, JT
中科院分区：
文献类型：
--
作者：
Huang, JM;Black, JT
考察了不同的切屑分离准则对加工过程有限元模拟的影响。研究了基于刀尖与前方节点距离的准则、基于刀尖前方单元最大剪应力的准则、基于剪切面平均最大剪应力的准则以及基于距离和应力组合的准则。仿真结果表明，在切屑与工件平稳分离的条件下，切屑分离判据的类型对切屑几何形状和应力应变分布影响不大。切屑分离准则的大小对切屑几何形状和切屑内的应力分布也没有显著影响，但它确实影响了切屑分离过程、加工表面的应力分布以及切屑和加工表面的有效塑性应变分布。在初始加工过程中，无论是几何准则还是物理准则都不能正确模拟加工过程。几何和物理标准的组合也在这项研究中被推荐。
Different chip separation criteria for the FEM simulation of machining were examined. Criterion based on distance between the tool tip and the node located immediately ahead, criterion based on maximum shear stress in the element ahead of the tool tip, criterion based on average maximum shear stress in the shear plane, and criterion based on a combination of distance and stress were investigated. Under conditions of smooth separation of chip from workpiece, simulation results showed that, during steady-state cutting, the type of chip separation criteria did not greatly affect chip geometry, nor distributions of stress and strain. The magnitude of the chip separation criteria also did not significantly affect chip geometry and distributions of stress in the chip but it did affect the chip separation process, distributions of stress in the machined surface, and distributions of effective plastic strain both in the chip and in the machined surface. During the initiation of cutting, neither the geometrical nor physical criteria simulate the machining process correctly. A combination of geometric and physical criteria was also recommended in this study.