Geometrically necessary dislocation density distributions in cyclically deformed Ti–6Al–4V
Acta Materialia, 2012 Abstract Cross-correlation-based electron backscattering diffraction analysis has been used to map lattice rotations in Ti–6Al–4V polycrystals deformed by load-controlled fatigue and dwell fatigue including a hold at maximum load. The lattice curvatures were used to form lower bound estimates of the geometrically necessary dislocation (GND) density ...
Littlewood, P, Wilkinson, A
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A finite element method to calculate geometrically necessary dislocation density: Accounting for orientation discontinuities in polycrystals [PDF]
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 +5 more
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Geometrically necessary dislocation densities in olivine obtained using high-angular resolution electron backscatter diffraction [PDF]
Ultramicroscopy, 2016 Dislocations 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 length scales are limited.
Wallis, D +3 more
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Consistent determination of geometrically necessary dislocation density from simulations and experiments [PDF]
International Journal of Plasticity, 2018 66 pages, 15 figures, 7 ...
Suchandrima Das +2 more
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Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures
MetalsThe complex thermal cycles during the solidification process in metal additive manufacturing (AM) lead to the formation of high-density dislocation networks, organizing into submicron-scale cellular structures.
Md Mahabubur Rohoman, Caizhi Zhou
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MetalsIn the framework of high temperature components, the need to evaluate the accumulated creep damage during service life is fundamental to extend the life of components which are currently deemed as scrap as per design intent.
Cristina Motta +4 more
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Size-dependent geometrically necessary dislocation structures in single-crystalline tungsten [PDF]
, 2022 Wedge indentation experiments were conducted to study the depth dependence of geometrically necessary dislocation (GND) structures in single-crystalline tungsten.
Weygand, Sabine M. +4 more
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Line-tension model for plasticity as the Gamma-limit of a nonlinear dislocation energy [PDF]
, 2012 In this paper we rigorously derive a line-tension model for plasticity as the Gamma-limit of a nonlinear mesoscopic dislocation energy, without resorting to the introduction of an ad hoc cut-off radius.
Scardia, L. +4 more
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Evolution of geometrically necessary dislocation density from computational dislocation dynamics
IOP Conference Series: Materials Science and Engineering, 2009 This paper presents a method for calculating GND densities in dislocation dynamics simulations. Evolution of suitably defined averages of GND density as well as maps showing the spatial nonuniform distribution of GNDs are analyzed under uniaxial loading.
P J Guruprasad, A A Benzerga
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Role of geometrically necessary dislocation density in multiaxial and non-proportional fatigue crack nucleation [PDF]
International Journal of Fatigue, 2020 Abstract 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.
Chen, B, Janssens, KGF, Dunne, FPE
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