A discrete dislocation dynamics modeling for thermal fatigue of preferred oriented copper via patterns

2010 ◽  
Vol 63 (7) ◽  
pp. 788-791 ◽  
Author(s):  
Gyu Seok Kim ◽  
Marc C. Fivel ◽  
Hyo-Jong Lee ◽  
Chansun Shin ◽  
Heung Nam Han ◽  
...  
Keyword(s):  
Thermal Fatigue ◽  
Dislocation Dynamics ◽  
Dynamics Modeling ◽  
Discrete Dislocation Dynamics ◽  
Discrete Dislocation ◽  
Preferred Oriented

The Effect of Multipoles on the Elasto-Plastic Properties of a Crystal: Theory and 3D Dislocation Dynamics Modeling

2021 ◽  
pp. 1-22
Author(s):  
Abu Bakar Siddique ◽  
Hojun Lim ◽  
Tariq Khraishi
Keyword(s):  
Plastic Deformation ◽  
Dislocation Dynamics ◽  
Dynamics Modeling ◽  
Proportional Limit ◽  
Softening Effect ◽  
Plastic Properties ◽  
Discrete Dislocation Dynamics ◽  
Scale Modeling ◽  
Discrete Dislocation ◽  
Elastoplastic Properties

Abstract Plastic deformation in metals is dominated by the interactions among dislocations and other defects inside the crystal. A large number of dislocation multipoles (dipoles, tripoles, quadrupoles, etc.) can form during plastic deformation. Depending on the relative position and the orientation of the dislocations, interactions in and between multipoles can change the elastoplastic properties of a material. The authors of this article investigate the effect of dislocation multipoles on the elastoplastic properties of a material. This is performed under different multipole configurations (i.e. the distance between active glide planes and the signs of the dislocations) using a 3D Discrete Dislocation Dynamics (DDD) code. The simulations show that multipoles exhibit a hardening/softening effect when the sign of the dislocations involved is the same, and a hardening effect only when the dislocations are of opposite sign to nearby ones. The distance between the two neighboring dislocations was also affecting the proportional limit for the material. Such hardening or flow stress results, as in this study, can be incorporated into larger-scale modeling work.

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