... external loads such as those encountered during high-rate events possibly near shock regime. The improved model accounts for deformation mechanisms such as thermally activated dislocation motion, generation, annihilation, and drag. It also accounts for the effects of material texture, recrystallization...

... of the logarithm of the creep rate as a result of the combination of both diffusional and dislocation type creeps. In this paper, a creep model, where the effect of mechanism change has been accounted for through an explicit dependence of the creep exponent n on stress, has been proposed. The model has been also...

...S. Groh; H. M. Zbib Discrete dislocation dynamics is a numerical tool developed to model the plasticity of crystalline materials at an intermediate length scale, between the atomistic modeling and the crystal plasticity theory. In this review we show, using examples from the literature, how...

.... 02 02 2009 03 04 2009 27 08 2009 bicrystals copper crystal microstructure dislocations grain boundaries impurities molecular dynamics method nanostructured materials plastic deformation plasticity slip stress-strain relations grain boundaries atomistic simulation...

... such as dislocation lines and loops is considered. The average deformation gradient for this element is decomposed multiplicatively into terms accounting for effects of dislocation flux, recoverable elastic stretch and rotation, and residual elastic deformation associated with self-equilibrating internal forces...

... 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...

...C. D. Landon; B. L. Adams; J. Kacher It has become apparent through experimentation at the micro- and nanolevels that the crystalline defects known as dislocations have significant effects on a material’s properties. Accordingly, a complete material state description must include...

...Behrouz Shiari; Ronald E. Miller; William A. Curtin Simulations of nanoindentation in single crystals are performed using a finite temperature coupled atomistic/continuum discrete dislocation (CADD) method. This computational method for multiscale modeling of plasticity has the ability of treating...

...M. Zehetbauer; E. Schafler; T. Unga´r; I. Kopacz; S. Bernstorff Dislocation densities, arrangements and long range internal stresses in cold rolled polycrystalline Cu, Ni, and Al, as well as in cold torsioned Fe, were determined by X-ray diffraction profile analysis using synchrotron radiation...

.... Then, the effect of irradiation on the material behavior is incorporated into the proposed model as a function of neutron fluence Φ by taking into account the interaction between irradiation-induced defects and movable dislocations. As regards the damage strain threshold p D , the mechanism of void nucleation due...