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Effect of special rotational deformation on dislocation emission from a semielliptical blunt crack tip in nanocrystalline solids

Published online by Cambridge University Press:  21 January 2013

Min Yu ,
Qihong Fang ,
Hui Feng  and
Youwen Liu
Min Yu
Affiliation:
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 4100082, Hunan, People’s Republic of China; and College of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha 410004, Hunan, People’s Republic of China
Qihong Fang*
Affiliation:
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, Hunan, People’s Republic of China
Hui Feng
Affiliation:
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, Hunan, People’s Republic of China
Youwen Liu
Affiliation:
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, Hunan, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: fangqh1327@tom.cn
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Abstract

The paper established a model to investigate the interaction between the special rotational deformation and a semielliptical blunt crack in deformed nanocrystalline materials. By using the complex variable method, the effect of a disclination quadrupole produced by the special rotational deformation on the emission of lattice dislocation from a semielliptical blunt crack tip was explored theoretically. The complex form expression of the dislocation force was derived, and the critical stress intensity factors (SIFs) for the first edge dislocation emission were calculated. Then, the influence of the disclination strength, the disclination location and orientation, the special rotational deformation orientation, the grain size, and the curvature radius of blunt crack tip on the critical SIFs were discussed in detail, and a comparison with the sharp crack behavior was presented. The results show that the special rotational deformation and the curvature radius of blunt crack have great effects on the lattice dislocation emission form blunt crack tip. Some influence laws are also different with those of the edge dislocation emission from a sharp crack tip.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 6 , 28 March 2013 , pp. 798 - 805
Copyright
Copyright © Materials Research Society 2013

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