Results 21 to 30 of about 9,137 (288)

Crystal plasticity analysis of micro-deformation, lattice rotation and geometrically necessary dislocation density [PDF]

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2012
A gradient-enhanced crystal plasticity model is presented that explicitly accounts for the evolution of the densities of geometrically necessary dislocations (GNDs) on individual slip systems of deforming crystals. The GND densities are fully coupled with the crystal slip rule.
Dunne, F, Kiwanuka, R, Wilkinson, A
openaire   +2 more sources

Consistent determination of geometrically necessary dislocation density from simulations and experiments

International Journal of Plasticity, 2018
66 pages, 15 figures, 7 ...
Suchandrima Das, Felix Hofmann, Edmund Tarleton   +2 more
openaire   +2 more sources

A finite element method to calculate geometrically necessary dislocation density: Accounting for orientation discontinuities in polycrystals

Acta Materialia, 2023
Strain gradients have been used to link various microscale deformation phenomena to the mechanical response of a polycrystalline material, revealing sub-crystal deformation structures. The strain gradients are computed in terms of the orientation gradients and then converted to geometrically necessary dislocation densities, a quantity considered ...
Demir, E, Horton, EW, Kareer, A, Collins, DM, Mostafavi, M, Knowles, D   +5 more
openaire   +1 more source

In Situ TEM Observation of Cooperative Grain Rotations and the Bauschinger Effect in Nanocrystalline Palladium

Nanomaterials, 2021
We report on cooperative grain rotation accompanied by a strong Bauschinger effect in nanocrystalline (nc) palladium thin film. A thin film of nc Pd was subjected to cyclic loading–unloading using in situ TEM nanomechanics, and the evolving ...
Ankush Kashiwar, Horst Hahn, Christian Kübel   +2 more
doaj   +1 more source

Revealing relationships between microstructure and hardening nature of additively manufactured 316L stainless steel

Materials & Design, 2021
Relationships between microstructures and hardening nature of laser powder bed fused (L-PBF) 316 L stainless steel have been studied. Using integrated experimental efforts and calculations, the evolution of microstructure entities such as dislocation ...
Luqing Cui, Shuang Jiang, Jinghao Xu, Ru Lin Peng, Reza Taherzadeh Mousavian, Johan Moverare   +5 more
doaj   +1 more source

Investigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction

Mechanical Engineering Journal, 2018
In this study, we investigated the mechanism of the indentation size effect based on measurement of the geometrically necessary (GN) dislocation density. The GN dislocation density was measured around impressions by electron backscatter diffraction (EBSD)
Shota HASUNUMA, Hirohisa MIYAZAKI, Kensuke SHIMADA, Takeshi OGAWA   +3 more
doaj   +1 more source

Nanoindentation and incipient plasticity [PDF]

, 1999
This paper presents a large-scale atomic resolution simulation of nanoindentation into a thin aluminum film using the recently introduced quasicontinuum method.
Miller, R., Ortiz, M., Phillips, R., Tadmor, E.B.   +3 more
core   +1 more source

Strain-hardening resilience via the cooperation of geometrically necessary dislocations and deformation twins in a strong and ductile lightweight high-entropy steel

Materials & Design
In the net-zero era, the burgeoning demands within engineering applications require materials that are not only lighter and stronger but also ductile.
Yi-Hsuan Sun, Shi-Wei Chen, Zen-Hao Lai, Shao-Lun Lu, Yi-Ting Lin, Jui-Fan Tu, Hung-Wei Yen   +6 more
doaj   +1 more source

Geometrically Necessary Dislocation Analysis of Deformation Mechanism for Magnesium under Fatigue Loading at 0 °C

Crystals, 2023
This study focused on the analysis of geometrically necessary dislocation (GND) densities for five selected fine-grained magnesium samples. Among the samples, three were tested under different fatigue-loading conditions at 0 °C, one experienced quasi ...
Qizhen Li
doaj   +1 more source

An observation on the experimental measurement of dislocation density

, 2013
The common practice of ignoring the elastic strain gradient in measurements of geometrically necessary dislocation (GND) density is critically examined. It is concluded that the practice may result in substantial errors.
Acharya, Amit, Knops, Robin J.
core   +3 more sources