A new material model for 2D numerical simulation of serrated chip formation when machining titanium alloy Ti-6Al-4V
A new material model for 2D numerical simulation of serrated chip formation when machining titanium alloy Ti-6Al-4V
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DOI：
10.1016/j.ijmachtools.2007.10.014
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发表时间：
2008-03-01
影响因子：
14
通讯作者：
Girot, Franck
中科院分区：
文献类型：
--
作者：
Calamaz, Madalina;Coupard, Dorninique;Girot, Franck
将一种新的材料本构关系应用于二维有限元模型，分析了钛合金加工过程中切屑的形成和剪切局部化。数值模拟使用商业有限元软件(Forge 2005(R))，能够解决复杂的热力问题。钛合金的主要加工特点之一是能够生产适应多种切割速度和进给量的分段切屑。本研究假设切屑分割只由绝热剪切带引起，在主剪切区没有材料破坏。新模型考虑了应变、应变速率和温度对流动应力的影响，并引入了应变软化效应。刀具切屑的摩擦符合库仑-特雷斯卡组合摩擦定律。研究了两种不同应变软化程度和加工参数对切削力和切屑形态的影响。将数值模拟预测的切屑形态、切削力和进给力与实验结果进行了比较。(C)2007爱思唯尔有限公司。保留所有权利。
A new material constitutive law is implemented in a 2D finite element model to analyse the chip formation and shear localisation when machining titanium alloys. The numerical simulations use a commercial finite element software (FORGE 2005 (R)) able to solve complex thermo-mechanical problems. One of the main machining characteristics of titanium alloys is to produce segmented chips for a wide range of cutting speeds and feeds. The present study assumes that the chip segmentation is only induced by adiabatic shear banding, without material failure in the primary shear zone. The new developed model takes into account the influence of strain, strain rate and temperature on the flow stress and also introduces a strain softening effect. The tool chip friction is managed by a combined Coulomb-Tresca friction law. The influence of two different strain softening levels and machining parameters on the cutting forces and chip morphology has been studied. Chip morphology, cutting and feed forces predicted by numerical simulations are compared with experimental results. (c) 2007 Elsevier Ltd. All rights reserved.