Strain-gradient crystal-plasticity modelling of micro-cutting of b.c.c. single crystal
Strain-gradient crystal-plasticity modelling of micro-cutting of b.c.c. single crystal
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DOI：
10.1007/s11012-015-0280-3
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发表时间：
2016-02
期刊：
影响因子：
2.7
通讯作者：
M. Demiral;A. Roy;V. Silberschmidt
中科院分区：
文献类型：
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作者：
M. Demiral;A. Roy;V. Silberschmidt
近年来，由于先进机器的设计、激光计量和计算机控制的改进，超精密加工变得越来越重要。在金属的微加工中，切割深度通常小于多晶聚集体的平均晶粒尺寸；因此，切割过程可以完全发生在单晶内。晶体各向异性的各自影响需要开发包含晶体塑性的加工模型，以便在这种条件下准确预测微尺度材料的去除。为此，在商业软件ABAQUS/Explicit中，利用用户自定义子程序VUMAT实现了b.c.c.黄铜单晶正交微切削的三维有限元模型。采用应变梯度晶体塑性理论分析了应变梯度演化对不同切削方向切削过程的影响。
In recent years thanks to enhancements in design of advanced machines, laser metrology and computer control, ultra-precision machining has become increasingly important. In micromachining of metals the depth of cut is usually less than the average grain size of a polycrystalline aggregate; hence, a cutting process can occur entirely within a single crystal. The respective effect of crystallographic anisotropy requires development of machining models that incorporate crystal plasticity for an accurate prediction of micro-scale material removal under such conditions. To achieve this, a 3D finite-element model of orthogonal micro-cutting of a single crystal of b.c.c. brass was implemented in a commercial software ABAQUS/Explicit using a user-defined subroutine VUMAT. Strain-gradient crystal-plasticity theories were used to demonstrate the influence of evolved strain gradients on the cutting process for different cutting directions.