scholarly journals A Dislocation-Crystal Plasticity Simulation on Large Deformation Considering Geometrically Necessary Dislocation Density and Incompatibility (1st Report, Definitions of GN Crystal Defects and Multiscale Modeling)

2006 ◽  
Vol 72 (719) ◽  
pp. 1009-1016
Author(s):  
Yoshiteru AOYAGI ◽  
Kazuyuki SHIZAWA
Keyword(s):  
Dislocation Density ◽  
Large Deformation ◽  
Multiscale Modeling ◽  
Crystal Plasticity ◽  
Crystal Defects ◽  
Geometrically Necessary Dislocation

Length-Scale-Dependent Micromechanical Modeling for Precipitate Hardening in Inconel 718 Superalloy

2021 ◽  
Vol 315 ◽  
pp. 84-89
Author(s):  
Chang Feng Wan ◽  
Dong Feng Li ◽  
Hai Long Qin ◽  
Ji Zhang ◽  
Zhong Nan Bi
Keyword(s):  
Dislocation Density ◽  
Strain Gradient ◽  
Inconel 718 ◽  
Micromechanical Modeling ◽  
Fe Model ◽  
Gradient Effect ◽  
Fine Mesh ◽  
Geometrically Necessary Dislocation ◽  
In718 Superalloy ◽  
Inconel 718 Superalloy

In this paper, a micromechanical finite element (FE) model has been proposed to investigate the effect of the nanoscale precipitates on the development of microplasticity for Inconel 718 (IN718) superalloy. A strain gradient crystal plasticity formulation has been developed with the considerations of the evolution of statistically stored dislocation density and geometrically necessary dislocation density. The mesh convergence has been examined, showing that sufficiently fine mesh is required in the FE model. The results show that the model with strain gradient effect incorporated shows less peak plastic strain and higher value of dislocation density than the model with no strain gradient effect. The present study indicates that the strain hardening process at the scale of strengthening precipitate is mainly governed by the evolution of geometrically necessary dislocation densities.

Experimental lower bounds on geometrically necessary dislocation density

2010 ◽  
Vol 26 (8) ◽  
pp. 1097-1123 ◽  
Author(s):  
J.W. Kysar ◽  
Y. Saito ◽  
M.S. Oztop ◽  
D. Lee ◽  
W.T. Huh
Keyword(s):  
Dislocation Density ◽  
Lower Bounds ◽  
Geometrically Necessary Dislocation
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