Results 1 to 10 of about 15,379 (289)
Consistent determination of geometrically necessary dislocation density from simulations and experiments [PDF]
International Journal of Plasticity, 2018 The use of Nye's dislocation tensor for calculating the density of geometrically necessary dislocations (GND) is widely adopted in the study of plastically deformed materials.
Suchandrima Das, F. Hofmann, E. Tarleton
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Resolving geometrically necessary dislocation density onto individual dislocation types using EBSD-based continuum dislocation microscopy [PDF]
International Journal of Plasticity, 2016 Abstract Modeling of plasticity is often hampered by the difficulty in accurately characterizing dislocation density on the microscale for real samples. It is particularly difficult to resolve measured dislocation content onto individual dislocation types at the length scales most commonly of interest in plasticity studies.
T. Ruggles, D. Fullwood, J. Kysar
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Journal of Materials Research and TechnologyThis study presents a comprehensive analysis of time evolution and spatial distribution of crystallographic geometrically necessary dislocation (GND) density induced by solid-state thermal cycling in an IN718 polycrystal.
Anderson Nascimento, Irene J. Beyerlein
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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.
F. Dunne, R. Kiwanuka, A. Wilkinson
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Quantifying geometrically necessary dislocation density during hot deformation in AA6082 Al alloy [PDF]
Materials Science and Engineering: A, 2021 Physically based constitutive equations incorporating the key microstructural mechanisms e.g. dislocations, grain size, etc, have been used widely to predict the stress-strain behaviour of alloys at plastic and viscoplastic conditions.
Jing-Hua Zheng +4 more
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Geometrically necessary dislocation densities in olivine obtained using high-angular resolution electron backscatter diffraction [PDF]
Ultramicroscopy, 2016 © 2016 The AuthorsDislocations in geological minerals are fundamental to the creep processes that control large-scale geodynamic phenomena. However, techniques to quantify their densities, distributions, and types over critical subgrain to polycrystal ...
Hansen, L, Wallis, D, Wilkinson, A
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Acta Materialia, 2022 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 ...
E. Demir +5 more
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Materials Science and Engineering: A, 2021 Abstract The role of microstructure and strain rate on the development of geometrically necessary dislocation (GND) density in polycrystalline copper subjected to compression is assessed via crystal plasticity modelling and electron microscopy. Micropolar crystal plasticity finite element (MP-CPFE) simulations show that GND density is strongly ...
D. Foley +6 more
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Role of geometrically necessary dislocation density in multiaxial and non-proportional fatigue crack nucleation [PDF]
International Journal of Fatigue, 2020 Experimental and crystal plasticity modelling studies have been carried out to investigate non-proportionality and stress state effects in fatigue in a 316 stainless steel and nickel-based superalloy RR1000 which have substantial effects on fatigue life.
Bo Chen, K. Janssens, F. Dunne
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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 +3 more
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