Inelastic Behavior and Grain-Boundary Effects in Polycrystalline Materials

2006 ◽  
Vol 978 ◽  
Author(s):  
Jibin Shi ◽  
Mohammed Zikry ◽  
Tarek Moustafa Hatem
Keyword(s):  
Dislocation Density ◽  
Grain Boundary ◽  
Boundary Effects ◽  
Polycrystalline Materials ◽  
Inelastic Behavior ◽  
Multiple Slip ◽  
Computational Schemes ◽  
Grain Boundary Effects ◽  
Polycrystalline Aggregates

AbstractDislocation-density based multiple-slip constitutive formulations and specialized computational schemes are introduced to account for grain-boundary (GB) effects in polycrystalline aggregates. New kinematically based interfacial grain-boundary regions and formulations are introduced to account for dislocation-density transmission, absorption, and pile-ups that may occur due to CSL grain-boundary misorientations.

Failure Modes and Grain-Boundary Effects in Polycrystalline Materials

2004 ◽  
Vol 819 ◽  
Author(s):  
M. A. Zikry ◽  
W. M. Ashmawi
Keyword(s):  
Dislocation Density ◽  
Grain Boundary ◽  
Failure Modes ◽  
Large Strain ◽  
Ductile Failure ◽  
Boundary Effects ◽  
Polycrystalline Materials ◽  
Multiple Slip ◽  
Computational Schemes ◽  
Polycrystalline Aggregates

AbstractDislocation-density based multiple-slip constitutive formulations and specialized computational schemes are introduced to account for large-strain ductile failure modes in polycrystalline aggregates. Furthermore, new kinematically based interfacial grain-boundary regions and formulations are introduced to account for dislocation-density transmission, absorption, and pile-ups that may occur due to grain-boundary misorientations and void interactions.

Microstructurally Induced Ductile Deformation Mechanisms and Grain-Boundary Effects in Polycrystalline Aggregates

1999 ◽  
Vol 578 ◽  
Author(s):  
W. M. Ashmawi ◽  
M. A. Zikry
Keyword(s):  
Dislocation Density ◽  
Grain Boundary ◽  
Large Strain ◽  
Ductile Deformation ◽  
Boundary Effects ◽  
Deformation Mechanisms ◽  
Multiple Slip ◽  
Computational Schemes ◽  
Polycrystalline Aggregates ◽  
Deformation Modes

AbstractDislocation-density based multiple-slip constitutive formulations and specialized computational schemes are introduced to account for large-strain ductile deformation modes in polycrystalline aggregates. Furthermore, new kinematically based interfacial grain-boundary regions and formulations are introduced to account for dislocation-density transmission, absorption, and pile-ups that may occur due to grain-boundary misorientations and properties.

Prediction of Grain-Boundary Interfacial Mechanisms in Polycrystalline Materials

2001 ◽  
Vol 124 (1) ◽  
pp. 88-96 ◽  
Author(s):  
W. M. Ashmawi ◽  
M. A. Zikry
Keyword(s):  
Dislocation Density ◽  
Grain Boundary ◽  
Material Behavior ◽  
Polycrystalline Materials ◽  
Total Dislocation Density ◽  
Dislocation Densities ◽  
Multiple Regions ◽  
Polycrystalline Aggregates ◽  
And Control ◽  
Deformation Modes

A multiple slip dislocation-density based crystalline formulation has been coupled to a kinematically based scheme that accounts for grain-boundary (GB) interfacial interactions with dislocation densities. Specialized finite-element formulations have been used to gain detailed understanding of the initiation and evolution of large inelastic deformation modes due to mechanisms that can result from dislocation-density pile-ups at GB interfaces, partial and total dislocation-density transmission from one grain to neighboring grains, and dislocation density absorption within GBs. These formulations provide a methodology that can be used to understand how interactions at the GB interface scale affect overall macroscopic behavior at different inelastic stages of deformation for polycrystalline aggregates due to the interrelated effects of GB orientations, the evolution of mobile and immobile dislocation-densities, slip system orientation, strain hardening, geometrical softening, geometric slip compatibility, and localized plastic strains. Criteria have been developed to identify and monitor the initiation and evolution of multiple regions where dislocation pile-ups at GBs, or partial and total dislocation density transmission through the GB, or absorption within the GB can occur. It is shown that the accurate prediction of these mechanisms is essential to understanding how interactions at GB interfaces affect and control overall material behavior.

Grain boundary effects on dielectric, infrared and Raman response of SrTiO3 nanograin ceramics

2006 ◽  
Vol 26 (14) ◽  
pp. 2855-2859 ◽  
Author(s):  
Jan Petzelt ◽  
Tetyana Ostapchuk ◽  
Ivan Gregora ◽  
Maxim Savinov ◽  
Dagmar Chvostova ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Boundary Effects ◽  
Grain Boundary Effects ◽  
Raman Response

Studies on grain boundary effects in spray deposited BICOVOX 0.1 films on platinum-coated stainless steel substrate

Ionics ◽  
2010 ◽  
Vol 17 (1) ◽  
pp. 69-74 ◽  
Author(s):  
Rajeev Joshi ◽  
Ratikant Mishra ◽  
C. A. Betty ◽  
Shilpa Sawant ◽  
S. H. Pawar
Keyword(s):  
Stainless Steel ◽  
Grain Boundary ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Boundary Effects ◽  
Grain Boundary Effects
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