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The structure and energetics of, and the plasticity caused by, Eshelby dislocations

International Journal of Plasticity

Weinberger, Christopher R.

The structure of coaxial, or Eshelby, dislocations are computed using isotropic elasticity for arrays of up to 500 dislocations. The energies of these arrays are determined in order to predict the lowest energy configuration and multiple meta-stable configurations are often found. The energy from these elasticity predictions shows good agreement with molecular statics simulations of aluminum. From these simulations, the torque-twist curves are predicted and compared with molecular dynamics simulations.© 2011 Elsevier Ltd. All rights reserved.

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TYPE Journal Article YEAR 2011
ScopusOSTIDOI

A micromechanical framework for simulating the deformation response of BCC metals

Battaile, Corbett C.; Weinberger, Christopher R.

Recently, molecular dynamics simulations (e.g. Groger et al. Acta Mat. vol.56) have uncovered new insights into dislocation motion associated with plastic deformation of BCC metals. Those results indicate that stress necessary for glide along 110[111] crystallographic systems plus additional shear stresses along non-glide directions may accurately characterize plastic flow in BCC crystals. Further, they are readily adaptable to micromechanical formulations used in crystal plasticity models. This presentation will discuss an adaptation into a classical mechanics framework for use in a large scale rate-dependent crystal plasticity model. The effects of incorporating the non-glide influences on an otherwise associative flow model are profound. Comparisons will be presented that show the effect of the non-glide stress components on tension-compression yield stress asymmetry and the evolution of texture in BCC crystals.

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TYPE Conference YEAR 2010
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Results 51–63 of 63
Results 51–63 of 63