منابع مشابه
Coupling discrete dislocation dynamics with polycrystal plasticity
Lebensohn et al. [1] recently introduced an alternative description of crystal plasticity based on a fast-Fourier transform (FFT) algorithm. The FFT approach solves for the equilibrium stress and strains under the constraint of strain compatibility for systems with periodic microstructures. As currently developed, the FFT model describes plasticity with a set of elasto-viscoplastic constitutive...
متن کاملTowards Macroscopic Plasticity from Microscopic Discrete Dislocation Dynamics
Dislocations are topological line defects in the crystalline structure of a lattice. They carry a vectorial charge with units of length and magnitude at the Angstrom scale. Being defects in the lattice structure, they induce high localized stresses in the body. Their motion in huge numbers produces permanent deformation of macroscopic solids (i.e. ductility) of the order of doubling or halving ...
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To closely analyze the dislocation structure evolution during nano-indentation, a multi-scale discrete dislocation plasticity code is modified to include nano-indentation loading. This code couples two length scales, discrete dislocation dynamics and continuum finite element analysis and has been successfully applied to analyze various problems in mechanics and materials science. Description of...
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A multiscale modeling methodology that combines the predictive capability of discrete dislocation plasticity and the computational efficiency of continuum crystal plasticity is developed. Single crystal configurations of different grain sizes modeled with periodic boundary conditions are analyzed using discrete dislocation plasticity (DD) to obtain grain size-dependent stress-strain predictions...
متن کاملDislocation Plasticity: Overview
An arbitrary deformation of a material can always be described as the sum of a change in volume and a change in shape at constant volume (shear). Assuming constant structure, the change in volume is recovered when the load is removed, since the atoms can simply relax back to their equilibrium sizes. The change in shape, on the other hand, may or may not be recovered, since the atoms can relax i...
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ژورنال
عنوان ژورنال: Key Engineering Materials
سال: 2003
ISSN: 1662-9795
DOI: 10.4028/www.scientific.net/kem.233-236.13