Effect of strain gradients and heterogeneity on flow strength of particle reinforced metal-matrix composites

被引:6
作者
Duan, DM
Wu, NQ
Zhao, M
Slaughter, WS
Mao, SX [1 ]
机构
[1] Univ Pittsburgh, Dept Mech Engn, Pittsburgh, PA 15261 USA
[2] Univ Calgary, Dept Mech Engn, Calgary, AB T2N 1N4, Canada
来源
JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME | 2002年 / 124卷 / 02期
关键词
D O I
10.1115/1.1417487
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
This paper deals with an analysis of the size effect on the flow strength of metal-matrix composites due to the presence of geometrically necessary dislocations. The work, is based upon a cell model of uniaxial deformation. The deformation field is analyzed based on a requirement of the deformation compatibility along the interface between the particle and the matrix, which in turn is completed through introducing an array of geometrically necessary dislocations. The results of modelling show that the overall stress-strain relationship is dependent not only on the particle volume fraction but also on the particle size. It has been found that the material length scale in the strain gradient plasticity is dependent on the particle volume fraction, or in other words, on the relative ratio of the particle spacing to the particle size. The strain gradient is, besides the macro-strain and the particle volume fraction, inversely proportional to the particle size.
引用
收藏
页码:167 / 173
页数:7
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