Modeling of the size effects on the behavior of metals in microscale deformation processes

被引:123
作者
Kim, Gap-Yong
Ni, Jun
Koc, Muammer
机构
[1] Virginia Commonwealth Univ, Dept Mech Engn, NSF I UCR Ctr Precis Forming, Richmond, VA 23284 USA
[2] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA
来源
JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME | 2007年 / 129卷 / 03期
关键词
microforming; miniaturization; scaling effect; size effect;
D O I
10.1115/1.2714582
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
For the accurate analysis and design of microforming process, proper modeling of material behavior at the micro/mesoscale is necessary by considering the size effects. Two size effects are known to exist in metallic materials. One is the '' grain size '' effect, and the other is the '' featurelspecimen size '' effect. This study investigated the feature/ specimen size effect and introduced a scaling model which combined both feature/ specimen and grain size effects. Predicted size effects were compared with three separate experiments obtained from previous research: a simple compression with a round specimen, a simple tension with a round specimen, and a simple tension in sheet metal. The predicted results had a very good agreement with the experiments. Quantification of the miniaturization effect has been achieved by introducing two parameters, a and 6, which can be determined by the scaling parameter n, to the Hall-Petch equation. The scaling model offers a simple way to model the size effect down to length scales of a couple of grains and to extend the use of continuum plasticity theories to micro/mesolength scales.
引用
收藏
页码:470 / 476
页数:7
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