Results 251 to 260 of about 3,253,810 (284)
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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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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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Experimental lower bounds on geometrically necessary dislocation density
International Journal of Plasticity, 2010zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Kysar, J. W. +4 more
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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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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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Crystal plasticity model with enhanced hardening by geometrically necessary dislocation accumulation
Journal of the Mechanics and Physics of Solids, 2002zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Evers, L.P. +3 more
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Finite element analysis of geometrically necessary dislocations in crystal plasticity
International Journal for Numerical Methods in Engineering, 2012SUMMARYWe present a finite element method for the analysis of ductile crystals whose energy depends on the density of geometrically necessary dislocations (GNDs). We specifically focus on models in which the energy of the GNDs is assumed to be proportional to the total variation of the slip strains.
Hurtado, Daniel E., Ortiz, Michael
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Gradients of geometrically necessary dislocations from white beam microdiffraction
Materials Science and Engineering: A, 2005Abstract Variations in the local crystallographic orientation due to the presence of geometrically necessary dislocations and dislocation boundaries smear the distribution of intensity near Laue reflections. Here, some simple model distributions of geometrically necessary dislocations, GNDs, are used to estimate the dislocation tensor field from the ...
R.I. Barabash, G.E. Ice, J.W.L. Pang
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Crystallographic aspects of geometrically-necessary and statistically-stored dislocation density
Acta Materialia, 1999Abstract Classical plasticity has reached its limit in describing crystalline material behavior at the micron level and below. Its inability to predict size-dependent effects at this length scale has motivated the use of higher-order gradients to model material behavior at the micron level.
A Arsenlis, D.M Parks
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Zeitschrift für angewandte Mathematik und Physik, 2020
The paper studies the geometric dislocation density tensor and Burgers vector using an elastic-plastic decomposition of Laplace stretch which arises from a QR decomposition of the deformation gradient and allows for direct experimental measurement. The geometric dislocation density tensor is obtained using the classical argument of failure of a Burgers
Sandipan Paul, Alan D. Freed
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The paper studies the geometric dislocation density tensor and Burgers vector using an elastic-plastic decomposition of Laplace stretch which arises from a QR decomposition of the deformation gradient and allows for direct experimental measurement. The geometric dislocation density tensor is obtained using the classical argument of failure of a Burgers
Sandipan Paul, Alan D. Freed
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