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  • 郑勇刚 ( 教授 )

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Coupling effect of twin boundary and void on the mechanical properties of bulk nanotwinned copper: an atomistic simulation

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论文类型:期刊论文
第一作者:Wang, Lei
通讯作者:Zheng, YG (reprint author), Dalian Univ Technol, Fac Vehicle Engn & Mech, Dept Engn Mech, Int Res Ctr Computat Mech,State Key Lab Struct An, Dalian 116024, Peoples R China.
合写作者:Sun, Jia,Li, Qian,Li, Zhiming,Zheng, Yonggang
发表时间:2019-01-30
发表刊物:JOURNAL OF PHYSICS D-APPLIED PHYSICS
收录刊物:SCIE、Scopus
卷号:52
期号:5
ISSN号:0022-3727
关键字:nanotwinned copper; nanovoid; mechanical property; molecular dynamics simulation; uniaxial tension
摘要:Molecular dynamics simulations are performed to analyze the uniaxial tensile deformation behaviors of nanotwinned copper bulk containing pre-existing multiple spherical/ellipsoidal voids. The effects of twin-boundary spacing, initial void size, void fraction, void shape, void orientation angle and loading orientation on the mechanical properties are examined by considering the stress-strain response and dislocation activity. Results illuminate that the coherent twin boundary can significantly enhance the strength of bulk copper. The critical stress for dislocation emission in the copper specimen depends mainly on the size of voids, which can influence the yield stress of nanotwinned copper. Less stress is required to emit dislocations from larger voids than smaller ones. In general, the larger initial void porosity is accompanied by smaller elastic modulus and critical stress. Furthermore, it is found that different dislocation patterns can be triggered under different loading orientations.

 

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