Molecular dynamics simulation of interaction of a dislocation array from a crack tip with grain boundaries
文献类型：期刊论文
| 作者 | Zhang YW(张永伟); Wang ZQ(王自强)
|
| 刊名 | Modelling and Simulation in Materials Science and Engineering
 |
| 出版日期 | 1996 |
| 卷号 | 4期号:2页码:231-244 |
| 关键词 | Brittle-Ductile Transition Computer-Simulation Tilt Boundaries Deformation Fracture Metals Model Dissociation Migration |
| ISSN号 | 0965-0393 |
| 通讯作者 | Zhang, YW (reprint author), CHINESE ACAD SCI,INST MECH,LNM,BEIJING 100080,PEOPLES R CHINA. |
| 中文摘要 | The interaction of a dislocation array emitted from a crack tip under mode II loading with asymmetric tilt grain boundaries (GBs) is analysed by the molecular dynamics method. The GBs can generally be described by planar and linear matching zones and unmatching zones. All GBs are observed to emit dislocations. The GBs migrated easily due to their planar and linear matching structure and asymmetrical type. The diffusion induced by stress concentration is found to promote the GB migration. The transmissions of dislocations are either along the matched plane or along another plane depending on tilt angle theta. Alternate processes of stress concentration and stress relaxation take place ahead of the pileup. The stress concentration can be released either by transmission of dislocations, by atom diffusion along GBs, or by migration of GBs by formation of twinning bands. The simulated results also unequivocally demonstrate two processes, i.e. asymmetrical GBs evolving into symmetrical ones and unmatching zones evolving into matching ones during the loading process. |
| 类目[WOS] | Materials Science, Multidisciplinary ; Physics, Applied |
| 研究领域[WOS] | Materials Science ; Physics |
| 关键词[WOS] | BRITTLE-DUCTILE TRANSITION ; COMPUTER-SIMULATION ; TILT BOUNDARIES ; DEFORMATION ; FRACTURE ; METALS ; MODEL ; DISSOCIATION ; MIGRATION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:A1996UM92100009 |
| 公开日期 | 2009-08-03 ; 2010-08-20 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/39136]  |
| 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 | Zhang YW,Wang ZQ. Molecular dynamics simulation of interaction of a dislocation array from a crack tip with grain boundaries[J]. Modelling and Simulation in Materials Science and Engineering,1996,4(2):231-244. |
| APA | 张永伟,&王自强.(1996).Molecular dynamics simulation of interaction of a dislocation array from a crack tip with grain boundaries.Modelling and Simulation in Materials Science and Engineering,4(2),231-244. |
| MLA | 张永伟,et al."Molecular dynamics simulation of interaction of a dislocation array from a crack tip with grain boundaries".Modelling and Simulation in Materials Science and Engineering 4.2(1996):231-244. |
入库方式： OAI收割
来源：力学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。