Simulation of AZ91D Processed by Equal Channel Angular Extrusion when Inner Corner Radius is not Zero

Zhang Xiaohua Luo Shoujing

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Simulation of AZ91D Processed by Equal Channel Angular Extrusion when Inner Corner Radius is not Zero
Issue S1, Pages: 262-265(2007)
Published：2007
DOI：
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[1]张晓华,罗守靖.模具内角半径不为零时镁合金等径道角挤压数值模拟[J].特种铸造及有色合金,2007(S1):262-265. DOI：

Zhang Xiaohua Luo Shoujing. Simulation of AZ91D Processed by Equal Channel Angular Extrusion when Inner Corner Radius is not Zero[J]. Special Casting & Nonferrous Alloys, 2007, (S1): 262-265. DOI：

摘要

采用Pro/E建立等径道角挤压（ECAE）的几何模型

通过压缩试验获取AZ91D镁合金的高温应力应变曲线

采用有限元软件DEFORM-3D对ECAE挤压变形过程进行了模拟

分析了内外转角部位的应力（平均应力、最大主应力和等效应力）变化

应变分布情况、网格变化等

以揭示等径道角挤压变形跟模具内转角半径的关系。结果表明

模具内转角半径不为零时

坯料挤压过程中

将有正应力存在

并且内外转角应力变化不尽相同;同时

应变分布不均匀

具有一定梯度;内转角部位

除了剪切

还承受压缩作用

外转角反之。

Abstract

A model of equal channel angular extrusion （ECAE） was built up by PRO/E. The stress-stain curve of AZ91D magnesium alloy in elevated temperature was gained though compression experiments. The extrusion process was simulated using finite element software DEFORM-3D. The variation of stress （mean stress

max principle stress

effective stress） in the inner and outer corner

the distribution of strain

the lattice change were obtained to discover the relation between the radius of inner corner and the mechanics of extrusion. The results show that there exist normal stresses in the extrusion process when the radius of inner corner is not zero. The stresses in inner corner and outer corner are not same.In the inner corner

besides the simple shear

there are compression

and in the outer corner

tension.The strain is non-homogeneous and appears a graded distribution.