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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.5; Jul 7-11, 2003; Leganes, Madrid, Spain >Prediction of Material Flow Pattern in the Hot Extrusion of Aluminium Alloys by the Finite Element Method
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Prediction of Material Flow Pattern in the Hot Extrusion of Aluminium Alloys by the Finite Element Method

机译：铝合金热挤压过程中材料流型的有限元预测

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摘要

Understanding the material flow pattern in the hot extrusion of aluminium alloys is useful for a better control of the process. The material flow pattern is greatly affected by the friction between the tool and billet interface. In this communication, an inverse analysis method is firstly adopted to match the calculated extrusion force with the measured force by treating the friction law and the friction coefficient as free parameters. Three widely accepted friction laws are investigated: Tresea friction, Coulomb friction and viscoplastic friction. The use of Tresca friction is shown to yield more accurate results and explanations than the other models. The influence of the constitutive laws on the material flow pattern is emphasized. It is found that the use of the elasto-plastic model gives a much better prediction than the use of the visco-plastic model. It is also found that the quasi-static deformation is not fully established until a short time after the peak load has occurred.
机译：了解铝合金热挤压过程中的材料流态对于更好地控制工艺很有帮助。物料的流动方式在很大程度上受到工具和坯料界面之间的摩擦的影响。在这种通信中，首先采用反分析方法，通过将摩擦定律和摩擦系数作为自由参数，将计算出的挤压力与测得的力进行匹配。研究了三种广泛接受的摩擦定律：海摩擦，库仑摩擦和粘塑性摩擦。与其他模型相比，使用Tresca摩擦可得出更准确的结果和解释。强调了本构定律对材料流型的影响。已经发现，使用弹塑性模型比使用粘塑性模型能提供更好的预测。还发现，直到出现峰值载荷后的短时间内，准静态变形才完全建立。

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