Results 171 to 180 of about 377 (207)
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Scripta Materialia, 2003
Abstract The concept of statistically stored and geometrically necessary dislocations is discussed in terms of observed deformation microstructures subdivided by incidental dislocation and geometrically necessary boundaries. This discussion is illustrated by examples of microstructures formed under conditions of homogeneous and nonhomogeneous ...
D A Hughes
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Abstract The concept of statistically stored and geometrically necessary dislocations is discussed in terms of observed deformation microstructures subdivided by incidental dislocation and geometrically necessary boundaries. This discussion is illustrated by examples of microstructures formed under conditions of homogeneous and nonhomogeneous ...
D A Hughes
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Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2022
Qinyang Zhao
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Qinyang Zhao
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On the characterization of geometrically necessary dislocations in finite plasticity
Journal of the Mechanics and Physics of Solids, 2001zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Cermelli, Paolo, Gurtin, Morton E.
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Geometrically Necessary Dislocations in Deformed Martensitic Steel
Advanced Materials Research, 2014Effect of a size of closed structural formation on accumulation of dislocation density and its components at plastic deformation is studied. Main attention is given to a role of a division of boundaries of a different type. Structural formation sizes are determined and different parameters of structure defining micro-and mezolevel at development of ...
Nina Koneva +3 more
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Assessment of geometrically necessary dislocation levels derived by 3D EBSD
Acta Materialia, 2015Abstract Existing alternatives for the calculation of geometrically necessary dislocation (GND) densities from orientation fields are discussed. Importantly, we highlight the role of reference frames and consider different sources of error. A well-controlled micro cantilever bending experiment on a copper bicrystal has been analyzed by 3-dimensional ...
D Raabe, S Zaefferer
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The J-integral and geometrically necessary dislocations in nonuniform plastic deformation
International Journal of Plasticity, 2004zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Shi, M., Huang, Y., Gao, H.
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Length-scale effect due to periodic variation of geometrically necessary dislocation densities
International Journal of Plasticity, 2013 Abstract Strain gradient plasticity theories have been successful in predicting qualitative aspects of the length scale effect, most notably the increase in yield strength and hardness as the size of the deforming volume decreases. However new experimental methodologies enabled by recent developments of high spatial resolution diffraction methods in ...
Christian F Niordson, Jeffrey Kysar
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Where are the geometrically necessary dislocations accommodating small imprints?
Journal of Materials Research, 2009Electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) analyses of small indentations in copper single crystals exhibit only slight changes of the crystal orientation in the surroundings of the imprints. Far-reaching dislocations might be the reason for these small misorientation changes.
M. Rester, C. Motz, R. Pippan
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Acta Materialia, 2006
A dislocation density based constitutive model for face-centred cubic crystals is introduced and implemented into a crystal plasticity finite element framework. The approach assumes a homogeneous dislocation structure and tracks the dislocation evolution on each slip system.
Anxin Ma, Franz Roters, D Raabe
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A dislocation density based constitutive model for face-centred cubic crystals is introduced and implemented into a crystal plasticity finite element framework. The approach assumes a homogeneous dislocation structure and tracks the dislocation evolution on each slip system.
Anxin Ma, Franz Roters, D Raabe
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Scripta Materialia, 2003
Abstract The relations between mesoscopic plastic strain gradients, ‘geometrically necessary’ dislocations (GND), and dislocation dynamics are discussed. It is argued that the connection between GND and size effects in crystal plasticity should be established on the basis of dislocation dynamics, taking into account the specific deformation ...
Michael Zaiser, Elias C Aifantis
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Abstract The relations between mesoscopic plastic strain gradients, ‘geometrically necessary’ dislocations (GND), and dislocation dynamics are discussed. It is argued that the connection between GND and size effects in crystal plasticity should be established on the basis of dislocation dynamics, taking into account the specific deformation ...
Michael Zaiser, Elias C Aifantis
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