Deformation Mechanism in Primary Deformation Zone during Micro-cutting Processes

Abstract

Abstract:

The strain gradient plasticity theory was used as the constitutive equation to illustrate the material properties at micro scale. The present paper employed the FEM to determine the distribution of effective stresses and strains when machining an AISI 1045 steel. The effect of the ratio of the uncut chip thickness to cutting edge radius on the distribution of effective stress and strain was analyzed.Orthogonal micro-cutting experiments were performed to obtain the chip roots to measure micro-hardness and metallographic sections of the chip roots. Strain gradient in the primary deformation zone

is proven to exist,which validates the simulation results.

Key words: micro-cutting, deformation mechanism, strain gradient, finite element method(FEM), effective strain

摘要：

将应变梯度塑性理论应用于微切削仿真过程的材料本构模型中,表征材料的微观尺度变形特性。进行了45钢微切削过程仿真,研究微切削第一变形区内的有效流动应力、有效应变分布及其变化规律,分析了切削厚度与切削刃口圆弧半径比对第一变形区有效流动应力和有效应变分布的影响。设计了正交微铣削实验,获得了切屑根部试样,并通过金相试验和显微硬度测试证明了微切削过程中第一变形区应变梯度的存在和微切削变形仿真结果的有效性。

关键词:

微切削, 变形机理, 应变梯度, 有限元方法, 有效应变

CLC Number:

TG506.1

TUN Ji-Hua-1, WANG Wen-Kui-1, LIU Zhan-Jiang-2.

Deformation Mechanism in Primary Deformation Zone during Micro-cutting Processes

[J]. China Mechanical Engineering, 2011, 22(15): 1797-1801.

吴继华1, 王文奎1, 刘战强2.

基于应变梯度塑性理论的微切削第一变形区应变分布研究

[J]. 中国机械工程, 2011, 22(15): 1797-1801.

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