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Keywords: dislocation density
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Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. April 2011, 133(2): 021026.
Published Online: March 24, 2011
... to this is provided based on the increase in dislocation density and necking in the tested specimens during high strain rate loading and the consequent stress wave attenuation as it propagates within the specimen. The fracture behavior and effect of high strain rate testing on microstructure changes are examined...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. April 2011, 133(2): 021007.
Published Online: March 4, 2011
... grain sizes were found to be 10%, 8%, and 8%, respectively, and (2) an average 27% drop in the dislocation density was observed between the machined and unmachined ECAE copper bars. The dislocation density was shown to have the most reduction ( − 39 % ) at the outer radius of the machined ECAE bar where...
Journal Articles
Article Type: Predictive Science And Technology In Mechanics And Materials
J. Eng. Mater. Technol. October 2009, 131(4): 041207.
Published Online: September 1, 2009
...T. M. Hatem; M. A. Zikry A multiple-slip dislocation-density-based crystalline formulation, specialized finite-element formulations, and Voronoi tessellations adapted to martensitic orientations were used to investigate dislocation-density activities and crack tip blunting in high strength...
Journal Articles
Article Type: Shear Behavior And Related Mechanisms In Materials Plasticity
J. Eng. Mater. Technol. January 2009, 131(1): 011103.
Published Online: December 18, 2008
... resulting from differences in dislocation densities within grains of varying orientations. The preliminary results are in agreement with experimental findings, i.e., grains with initial orientations close to D2 grow at the expense of neighboring grains during negative shear and vice versa. To clarify...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. January 2009, 131(1): 011002.
Published Online: December 15, 2008
... to dislocation densities is used in a specialized finite-element modeling framework. The asperity model and the loading conditions are based on realistic service conditions consistent with rf MEMS with metallic normal contacts. The evolving microstructure, stress fields, contact width, hardness, residual effects...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. April 2008, 130(2): 021024.
Published Online: April 2, 2008
... and capabilities associated with white-beam 3D X-ray microscopy are discussed, and both theoretical and experimental considerations associated with the measurement of Nye dislocation density tensors in deformed materials are presented. The ability to determine the local geometrically necessary dislocation (GND...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. April 2008, 130(2): 021004.
Published Online: March 12, 2008
... dislocation densities well above the average density in a typical annealed metal. The second challenge is developing a method of representation for the dislocated state. Unlike most state quantities, dislocation lengths are not conserved and complete representation would require tracking of position, momentum...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. October 2007, 129(4): 505–512.
Published Online: April 9, 2007
... experiments. The second model is a micromechanical based model using Taylor’s hardening law. It utilizes the behavior of dislocation densities at high strain rates in metals in order to relate dynamic hardness to strain rates. The latter model also accounts for any changes in temperature that could exist...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. July 2007, 129(3): 380–389.
Published Online: February 15, 2007
...Yuri Estrin; KiHo Rhee; Rimma Lapovok; Peter F. Thomson An established dislocation density related, one-internal variable model was used, with some modifications, as a basis for modeling the mechanical response of aluminum alloy AA6111. In addition to conventional rolling, equal channel angular...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. July 2003, 125(3): 237–246.
Published Online: July 10, 2003
... . Manuscript received by the Materials Division April 4, 2000; revised manuscript received December 18, 2001. Associate Editor: H. Zbib. 04 April 2000 18 December 2001 10 07 2003 steel recovery elasticity rolling buckling Young's modulus dislocation density indentation elastic...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. July 2002, 124(3): 329–334.
Published Online: June 10, 2002
... November 2001 06 March 2002 10 06 2002 copper indentation hardness plastic deformation slip stacking faults radiation hardening dislocation density plastic flow work hardening bending elasticity free energy boundary-value problems kinematics edge dislocations dislocation...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. July 2002, 124(3): 352–357.
Published Online: June 10, 2002
... calculations in the material softening regime. The approach is based on the introduction of length scale effects in dislocation dynamics and plasticity theory by incorporating higher order gradients of dislocation densities and strain, respectively, into the evolution or constitutive equations governing...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. July 2002, 124(3): 358–364.
Published Online: June 10, 2002
... February 19, 2002. Guest Editors: Tariq A. Khraishi and Hussein M. Zbib. 19 January 2002 19 February 2002 10 06 2002 plasticity hardness indentation slip plastic flow hardening recovery dislocation density elastic deformation kinematics torsion compressive strength...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. July 2002, 124(3): 380–387.
Published Online: June 10, 2002
... , respectively, and as a result the intermediate configuration properly defines the dislocation density tensors. Similar expressions were obtained by Kondo 24 , Nye 25 , Kroner 11 , Fleck and Hutchinson 26 , Naghdi and Srinivasa 27 , Fleck et al. 5 , Fleck and Hucthinson 28 , Shizawa and Zbib 29 , Gao et...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. January 2002, 124(1): 88–96.
Published Online: July 16, 2001
...W. M. Ashmawi; M. A. Zikry A multiple slip dislocation-density based crystalline formulation has been coupled to a kinematically based scheme that accounts for grain-boundary (GB) interfacial interactions with dislocation densities. Specialized finite-element formulations have been used to gain...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. January 2002, 124(1): 71–77.
Published Online: June 26, 2001
... to predict hardening curves corresponding to different proportional loading paths. The calculated curves were evaluated to elucidate the path dependence of hardening. In a recent paper 1 , a 2D constitutive model based on dislocation density evolution was proposed in an attempt to offer a constitutive...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. January 2002, 124(1): 2–6.
Published Online: May 21, 2001
...T. Unga´r; G. Riba´rik; J. Gubicza; P. Hana´k The dislocation densities and arrangement parameters and the crystallite size and size-distributions are determined in tensile or cyclically deformed polycrystalline copper specimens by X-ray diffraction peak profile analysis. The Fourier coefficients...