Revisiting the fundamentals of metal cutting by means of finite elements and ductile fracture mechanics
Revisiting the fundamentals of metal cutting by means of finite elements and ductile fracture mechanics
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DOI：
10.1016/j.ijmachtools.2006.05.003
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发表时间：
2007-03
影响因子：
14
通讯作者：
P. Rosa;P. Martins;A. Atkins
中科院分区：
文献类型：
--
作者：
P. Rosa;P. Martins;A. Atkins
本文研究了阿特金斯的思想，即金属切削的建模必须包括新表面形成的重要工作以及塑性流动和摩擦的传统组成部分。新的有限元和代数计算与专门设计的正交金属切削实验室控制条件下进行的铅标本。铅的机械性能的独立测定和理论预测和实验结果之间的比较。计算涵盖了广泛的主题，如材料流，切屑压缩因子，主剪切面角，切削力和比切削压力。它表明，选择铅作为工件材料揭示了重要的事实，将被掩盖的是通常的工件金属被切割。本文定量地表明，虽然材料流，切屑形成和主要的场变量的分布可以成功地模拟传统的“塑性和摩擦只有”分析，韧性断裂力学的贡献是必不可少的，以获得良好的估计切削力和特定的切削压力。
This paper investigates Atkins’ idea that the modelling of metal cutting must include the significant work involved in the formation of new surfaces as well as the traditional components of plastic flow and friction. New finite element and algebraic calculations are presented together with specially designed orthogonal metal cutting experiments performed on lead specimens under laboratory-controlled conditions. Independent determinations of the mechanical properties of lead were made and comparisons are given between theoretical predictions and experimental results. Calculations cover a wide range of topics such as material flow, chip-compression factor, primary shear plane angle, cutting force and specific cutting pressure. It is shown that the choice of lead as workpiece material reveals important facts that would be obscured were the usual sort of workpiece metals to be cut. The paper demonstrates quantitatively that while material flow, chip formation and the distribution of the major field variables can be modelled successfully by traditional ‘plasticity and friction only’ analyses, the contribution of ductile fracture mechanics is essential for obtaining good estimates of cutting forces and of the specific cutting pressure.