IMECH-IR  > 力学所知识产出(1956-2008)
A unified model for dislocation nucleation, dislocation emission and dislocation free zone
Wang ZQ(王自强); Wang KR(王克仁); Zhang YW(张永伟); Wang, TC (reprint author), CHINESE ACAD SCI,INST MECH,LNM,POB 603,BEIJING 100080,PEOPLES R CHINA.
Source PublicationInternational Journal of Fracture
1996
Volume78Issue:3-4Pages:227-239
ISSN0376-9429
AbstractIn this paper, a unified model for dislocation nucleation, emission and dislocation free zone is proposed based on the Peierls framework. Three regions are identified ahead of the crack tip. The emitted dislocations, located away from the crack tip in the form of an inverse pileup, define the plastic zone. Between that zone and the cohesive zone immediately ahead of the crack tip, there is a dislocation free zone. With the stress field and the dislocation density field in the cohesive zone and plastic zone being, respectively, expressed in the first and second Chebyshev polynomial series, and the opening and slip displacements in trigonometric series, a set of nonlinear algebraic equations can be obtained and solved with the Newton-Raphson Method. The results of calculations for pure shearing and combined tension and shear loading after dislocation emission are given in detail. An approximate treatment of the dynamic effects of the dislocation emission is also developed in this paper, and the calculation results are in good agreement with those of molecular dynamics simulations.
KeywordCrack-tip Fracture
DOI10.1007/BF00032475
Indexed BySCI
Language英语
WOS IDWOS:A1996VU18700003
WOS KeywordCRACK-TIP ; FRACTURE
WOS Research AreaMaterials Science ; Mechanics
WOS SubjectMaterials Science, Multidisciplinary ; Mechanics
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/39086
Collection力学所知识产出(1956-2008)
Corresponding AuthorWang, TC (reprint author), CHINESE ACAD SCI,INST MECH,LNM,POB 603,BEIJING 100080,PEOPLES R CHINA.
Recommended Citation
GB/T 7714
Wang ZQ,Wang KR,Zhang YW,et al. A unified model for dislocation nucleation, dislocation emission and dislocation free zone[J]. International Journal of Fracture,1996,78,3-4,:227-239.
APA 王自强,王克仁,张永伟,&Wang, TC .(1996).A unified model for dislocation nucleation, dislocation emission and dislocation free zone.International Journal of Fracture,78(3-4),227-239.
MLA 王自强,et al."A unified model for dislocation nucleation, dislocation emission and dislocation free zone".International Journal of Fracture 78.3-4(1996):227-239.
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