Finite element modelling of plastic instability during ECAP processing of flow-softening materials

被引：40
|
作者：
Figueiredo, Roberto Braga
Paulino Aguilar, Maria Teresa
Cetlin, Paulo Roberto
机构：
[1] Univ Fed Minas Gerais, Dept Met & Mat Engn, Sch Engn, BR-30160030 Belo Horizonte, MG, Brazil
[2] Univ Fed Minas Gerais, Dept Met & Civil Construct, Sch Engn, BR-30160030 Belo Horizonte, MG, Brazil
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 430卷 / 1-2期
关键词：
equal channel angular pressing (ECAP); flow-softening; unsteady flow; shear localization;
D O I：
10.1016/j.msea.2006.05.116
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A finite element analysis of the equal channel angular pressing (ECAP) of flow-softening materials is presented in this paper. A very fine mesh was used in the simulations, allowing a detailed analysis of the development of localized shear phenomena. Two different flow curves were used in the simulations; one displayed an initial flow-softening followed by perfect plastic behavior, whereas the other followed a constant flow-softening behavior. The flow-softening rate affects the intensity of shear localization. The deformation zone, that is usually concentrated around a fixed shear plane during processing of perfect plastic or strain hardening materials, splits into two parts and its position varies cyclically during the process, leading to oscillations in the punch load during processing. A comparison of the finite element predictions with those from the slip line field theory is also presented. (c) 2006 Elsevier B.V. All rights reserved.
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页码：179 / 184
页数：6
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