Simulation of deformation behaviour of Aluminium 7075 during Equal Channel Angular Pressing (ECAP)

MATEC Web of Conferences Pub Date : 2023-01-01 DOI:10.1051/matecconf/202337401002

H. Shagwira, J. Obiko, F. Mwema, T. Jen

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Abstract

This paper presents a finite element simulation of equal channel angular pressing (ECAP) since it is one of the most common and successful severe plastic deformation techniques. This study reports the influence of the most significant factors influencing the ECAP technique. Through finite element simulation, the effect of the die geometry, workpiece geometry, and the pressing speed on the effective strain distributions, damage, and pressing loads, were investigated. The influence of the ECAP method on different material models is also presented. Additionally, the prospective expansion and future applications of ECAP are herein highlighted. From the results, the die geometry of a 90° channel imparts the highest strains during ECAP. Additionally, specimens of rectangular geometry are susceptible to cracking and damage as compared to circular samples. It was found that very high processing speeds (>7mm/sec) are undesirable during ECAP since they cause very high internal stresses to the structure of the workpieces. Besides, processing at room temperature can achieve homogeneous strain distribution with minimum sample damage.

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7075铝合金等径角挤压变形行为模拟

由于等通道角挤压是最常见和最成功的剧烈塑性变形技术之一，本文对其进行了有限元模拟。本研究报告了影响ECAP技术的最重要因素。通过有限元仿真，研究了模具几何形状、工件几何形状和冲压速度对有效应变分布、损伤和冲压载荷的影响。介绍了ECAP方法对不同材料模型的影响。此外，本文还强调了ECAP的扩展前景和未来的应用。从结果来看，90°通道的模具几何形状在ECAP期间具有最高的应变。此外，与圆形样品相比，矩形几何形状的样品容易开裂和损坏。研究发现，在ECAP过程中，非常高的加工速度(>7mm/秒)是不可取的，因为它们会对工件的结构造成非常高的内应力。此外，在室温下加工可以实现均匀的应变分布和最小的样品损伤。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

MATEC Web of Conferences

自引率

0.00%

发文量

342

审稿时长

6 weeks

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