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| Molecular dynamics simulation of interaction of a dislocation array from a crack tip with grain boundaries | |
Zhang YW(张永伟); Wang ZQ(王自强) ; Zhang, YW (reprint author), CHINESE ACAD SCI,INST MECH,LNM,BEIJING 100080,PEOPLES R CHINA.
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| Source Publication | Modelling and Simulation in Materials Science and Engineering
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| 1996 | |
| Volume | 4Issue:2Pages:231-244 |
| ISSN | 0965-0393 |
| Abstract | 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. |
| Keyword | Brittle-ductile Transition Computer-simulation Tilt Boundaries Deformation Fracture Metals Model Dissociation Migration |
| DOI | 10.1088/0965-0393/4/2/009 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:A1996UM92100009 |
| WOS Keyword | BRITTLE-DUCTILE TRANSITION ; COMPUTER-SIMULATION ; TILT BOUNDARIES ; DEFORMATION ; FRACTURE ; METALS ; MODEL ; DISSOCIATION ; MIGRATION |
| WOS Research Area | Materials Science ; Physics |
| WOS Subject | Materials Science, Multidisciplinary ; Physics, Applied |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/39136 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Zhang, YW (reprint author), CHINESE ACAD SCI,INST MECH,LNM,BEIJING 100080,PEOPLES R CHINA. |
| Recommended Citation GB/T 7714 | Zhang YW,Wang ZQ,Zhang, YW . 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,&Zhang, YW .(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. |
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