The evolution of damage in perfect-plastic and strain hardening materials processed by equal-channel angular pressing

被引：40
作者：
Figueiredo, Roberto B. [1 ]
Cetlin, Paulo R. [2 ]
Langdon, Terence G. [1 ,3 ]
机构：
[1] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA
[2] Univ Fed Minas Gerais, Dept Met & Mat Engn, BR-30160030 Belo Horizonte, MG, Brazil
[3] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 518卷 / 1-2期
关键词：
Cracking; Damage; Equal-channel angular pressing (ECAP); Finite element modeling (FEM); Strain hardening; FINITE-ELEMENT-ANALYSIS; DEFORMATION-BEHAVIOR; BACK-PRESSURE; NANOSTRUCTURED MATERIALS; WORKING LOAD; EXTRUSION; HOMOGENEITY; ECAP; MAGNESIUM; FRACTURE;
D O I：
10.1016/j.msea.2009.04.007
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The evolution of damage was investigated for an aluminum alloy processed by equal-channel angular pressing. The investigation was performed for two different structural states: an annealed condition where there is strain hardening and a processed condition where the strain hardening capability is essentially exhausted and there is a near perfect-plastic behavior. Finite element modeling (FEM) was used with experimental data obtained from tension and compression testing at room temperature. The results show that high levels of damage may be accumulated in the material exhibiting strain hardening behavior and this may lead to billet segmentation whereas in the near perfect-plastic condition cracking occurs only on the upper surfaces of the billets and these cracks are reasonably stable. (C) 2009 Elsevier B.V. All rights reserved.
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收藏
页码：124 / 131
页数：8
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