The Flow Theory of Mechanism-Based Strain Gradient Plasticity
文献类型：期刊论文
| 作者 | Qiu X ; Huang Y; Wei YG(魏悦广); Gao H; Hwang KC
|
| 刊名 | Mechanics of Materials
 |
| 出版日期 | 2003 |
| 卷号 | 35页码:245-258 |
| ISSN号 | 0167-6636 |
| 通讯作者 | Huang, Y (reprint author), Univ Illinois, Dept Mech & Ind Engn, 1206 W Green St, Urbana, IL 61801 USA. |
| 中文摘要 | The flow theory of mechanism-based strain gradient (MSG) plasticity is established in this paper following the same multiscale, hierarchical framework for the deformation theory of MSG plasticity in order to connect with the Taylor model in dislocation mechanics. We have used the flow theory of MSG plasticity to study micro-indentation hardness experiments. The difference between deformation and flow theories is vanishingly small, and both agree well with experimental hardness data. We have also used the flow theory of MSG plasticity to investigate stress fields around a stationary mode-I crack tip as well as around a steady state, quasi-statically growing crack tip. At a distance to crack tip much larger than dislocation spacings such that continuum plasticity still applies, the stress level around a stationary crack tip in MSG plasticity is significantly higher than that in classical plasticity. The same conclusion is also established for a steady state, quasi-statically growing crack tip, though only the flow theory can be used because of unloading during crack propagation. This significant stress increase due to strain gradient effect provides a means to explain the experimentally observed cleavage fracture in ductile materials [J. Mater. Res. 9 (1994) 1734, Scripta Metall. Mater. 31 (1994) 1037; Interface Sci. 3(1996) 169]. |
| 学科主题 | 力学 |
| 类目[WOS] | Materials Science, Multidisciplinary ; Mechanics |
| 研究领域[WOS] | Materials Science ; Mechanics |
| 关键词[WOS] | DISCRETE DISLOCATION ANALYSIS ; METAL-MATRIX COMPOSITES ; CRACK-GROWTH ; SINGLE-CRYSTALS ; THIN-FILMS ; HARDNESS TESTS ; SIZE ; INDENTATION ; LOCALIZATION ; FRACTURE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000180597600007 |
| 公开日期 | 2007-06-15 ; 2007-12-05 ; 2009-06-23 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/16278]  |
| 专题 | 力学研究所_力学所知识产出(1956-2008) |
| 推荐引用方式 GB/T 7714 | Qiu X,Huang Y,Wei YG,et al. The Flow Theory of Mechanism-Based Strain Gradient Plasticity[J]. Mechanics of Materials,2003,35:245-258. |
| APA | Qiu X,Huang Y,魏悦广,Gao H,&Hwang KC.(2003).The Flow Theory of Mechanism-Based Strain Gradient Plasticity.Mechanics of Materials,35,245-258. |
| MLA | Qiu X,et al."The Flow Theory of Mechanism-Based Strain Gradient Plasticity".Mechanics of Materials 35(2003):245-258. |
入库方式： OAI收割
来源：力学研究所
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