Molecular dynamics simulations of void coalescence in monocrystalline copper under loading and unloading

Molecular dynamic calculations are used to examine the anisotropy of voids coalescence under loading and unloading conditions in monocrystalline coppers. In this paper, three typical orientations are investigated, including [100], [110], and [111]. The study shows that voids collapse after the shock...

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Bibliographic Details
Published in:Journal of applied physics 2016-04, Vol.119 (16)
Main Authors: Peng, Xiaojuan, Zhu, Wenjun, Chen, Kaiguo, Deng, Xiaoliang, Wei, Yongkai
Format: Article
Language:English
Subjects:
Anisotropy
Applied physics
Coalescing
Computer simulation
Dimensional analysis
Dislocations
Emission
Loads (forces)
Mathematical analysis
Molecular dynamics
Shock loading
Slip planes
Stress relaxation
Two dimensional analysis
Two dimensional models
Voids
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Summary:Molecular dynamic calculations are used to examine the anisotropy of voids coalescence under loading and unloading conditions in monocrystalline coppers. In this paper, three typical orientations are investigated, including [100], [110], and [111]. The study shows that voids collapse after the shock loading, leaving two disordered regions at the initial voids sites. Voids re-nucleate in the disordered regions and grow by the emission of dislocations on various slip planes. The dislocation motion contributes to local stress relaxation, which causes the voids to expand to certain radius and then coalesce with each other by dislocation emission. Due to the influence of the anisotropy shear field and different slip systems around the voids, the dislocations emit more easily at specific position, which lead to the anisotropy of void coalescence. A two-dimensional analysis model based on a shear dislocation is proposed and it explains the phenomena of void coalescence in the simulations quite well.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4947051