Investigations of shock-induced deformation and dislocation mechanism by a multiscale discrete dislocation plasticity model

2017 ◽  
Vol 131 ◽  
pp. 78-85 ◽  
Author(s):  
Jianqiao Hu ◽  
Zhanli Liu ◽  
Kaiguo Chen ◽  
Zhuo Zhuang
Keyword(s):  
Plasticity Model ◽  
Dislocation Mechanism ◽  
Discrete Dislocation ◽  
Dislocation Plasticity

scholarly journals Discrete Dislocation Plasticity

2005 ◽  
pp. 1115-1131 ◽  
Author(s):  
E. Van der Giessen ◽  
A. Needleman
Keyword(s):  
Discrete Dislocation ◽  
Dislocation Plasticity

A Discrete Dislocation Plasticity Analysis of Plane-Strain Indentation of a Single-Crystal Half-Space by a Smooth and a Rough Rigid Asperity

2010 ◽  
Author(s):  
X. Yin ◽  
K. Komvopoulos
Keyword(s):  
Single Crystal ◽  
Plane Strain ◽  
Half Space ◽  
Crystal Surface ◽  
Normal Load ◽  
Surface Profile ◽  
Dislocation Source ◽  
Discrete Dislocation ◽  
Dislocation Plasticity ◽  
Edge Dislocations

A discrete dislocation plasticity analysis of plane-strain indentation of a single-crystal half-space by a smooth or rough (fractal) rigid asperity is presented. The emission, movement, and annihilation of edge dislocations are incorporated in the analysis through a set of constitutive rules [1,2]. It is shown that the initiation of the first dislocation is controlled by the subsurface Hertzian stress field and occurs in the ±45° direction with respect to the normal of the crystal surface, in agreement with the macroscopic yielding behavior of the indented halfspace. For fixed slip-plane direction, the dislocation density increases with the applied normal load and dislocation source density. The dislocation multiplication behavior at a given load is compared with that generated by a rough indenter with a fractal surface profile. The results of the analysis provide insight into yielding and plastic deformation phenomena in indented single-crystal materials.

scholarly journals Discrete dislocation plasticity and crack tip fields in single crystals

2001 ◽  
Vol 49 (9) ◽  
pp. 2133-2153 ◽  
Author(s):  
E. Van der Giessen ◽  
V.S. Deshpande ◽  
H.H.M. Cleveringa ◽  
A. Needleman
Keyword(s):  
Single Crystals ◽  
Crack Tip ◽  
Crack Tip Fields ◽  
Discrete Dislocation ◽  
Dislocation Plasticity

scholarly journals Discrete dislocation plasticity analysis of single slip tension

2005 ◽  
Vol 400-401 ◽  
pp. 154-157 ◽  
Author(s):  
V.S. Deshpande ◽  
A. Needleman ◽  
E. Van der Giessen
Keyword(s):  
Single Slip ◽  
Discrete Dislocation ◽  
Dislocation Plasticity
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