Numerical and experimental study of dry cutting for an aeronautic aluminium alloy (A2024-T351)
Numerical and experimental study of dry cutting for an aeronautic aluminium alloy (A2024-T351)
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DOI：
10.1016/j.ijmachtools.2008.03.013
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发表时间：
2008-09-01
影响因子：
14
通讯作者：
Rigal, Jean-Francois
中科院分区：
文献类型：
--
作者：
Mabrouki, Tarek;Girardin, Francois;Rigal, Jean-Francois
本文提出了正交切削的数值模拟和实验方法，以研究航空铝合金（A2024-T351）的干切削。总体目标是理解切屑形成随切削速度变化的物理现象。对于数值模型，材料行为及其失效准则基于Johnson-Cook定律。该模型提出了材料损伤演化与断裂能之间的耦合。高速摄像机用于捕获切屑形成序列。数值结果表明，切屑与工件的接触和刀具的进给在切屑上产生弯曲载荷。因此，当切屑开始卷曲时，在前刀面上方发生破碎现象。计算结果与实验结果相吻合。数值结果预测了残余应力分布，并显示高值，沿着切削方向，在加工工件表面。(C)2008爱思唯尔有限公司保留所有权利。
In the present contribution, numerical and experimental methodologies concerning orthogonal cutting are proposed in order to study the dry cutting of an aeronautic aluminium alloy (A2024-T351). The global aim concerns the comprehension of physical phenomena accompanying chip formation according to cutting velocity variation.For the numerical model, material behaviour and its failure criterion are based on the Johnson-Cook law. The model proposes a coupling between material damage evolution and its fracture energy. A highspeed camera was used to capture the chip formation sequences. The numerical results show that the chip-workpiece contact and the tool advancement induce bending loads on the chip. Consequently, a fragmentation phenomenon takes place above the rake face when the chip begins to curl up. The computed results corroborate with experimental ones. The numerical results predict the residual stress distribution and show high values, along the cutting direction, on the machined workpiece surface. (C) 2008 Elsevier Ltd. All rights reserved.