Dislocation Nucleation and Pileup under a Wedge Contact at Nanoscale
Joint Authors
Source
Issue
Vol. 2008, Issue 2008 (31 Dec. 2008), pp.1-5, 5 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2008-03-16
Country of Publication
Egypt
No. of Pages
5
Main Subjects
Engineering Sciences and Information Technology
Chemistry
Civil Engineering
Abstract EN
Indentation responses of crystalline materials have been found to be radically different at micrometer and nanometer scales.
The latter is usually thought to be controlled by the nucleation of dislocations.
To explore this physical process, a dislocation mechanics study is performed to determine the conditions for the nucleation of a finite number of dislocations under a two-dimensional wedge indenter, using the Rice-Thomson nucleation criterion.
The configurational force on the dislocation consists of the applied force, the image force, and the interaction force between dislocations.
Dislocations reach equilibrium positions when the total driving force equals the effective Peierls stress, giving a set of nonlinear equations that can be solved using the Newton-Raphson method.
When the apex angle of the wedge indenter increases, the critical contact size for dislocation nucleation increases rapidly, indicating that dislocation multiplication near a blunt wedge tip is extremely difficult.
This geometric dependence agrees well with experimental findings.
American Psychological Association (APA)
Gao, Y. F.& Lou, Jun. 2008. Dislocation Nucleation and Pileup under a Wedge Contact at Nanoscale. Journal of Nanomaterials،Vol. 2008, no. 2008, pp.1-5.
https://search.emarefa.net/detail/BIM-467539
Modern Language Association (MLA)
Gao, Y. F.& Lou, Jun. Dislocation Nucleation and Pileup under a Wedge Contact at Nanoscale. Journal of Nanomaterials No. 2008 (2008), pp.1-5.
https://search.emarefa.net/detail/BIM-467539
American Medical Association (AMA)
Gao, Y. F.& Lou, Jun. Dislocation Nucleation and Pileup under a Wedge Contact at Nanoscale. Journal of Nanomaterials. 2008. Vol. 2008, no. 2008, pp.1-5.
https://search.emarefa.net/detail/BIM-467539
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-467539