| Issue |
J. Phys. IV France
Volume 134, August 2006
EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
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| Page(s) | 17 - 22 | |
| DOI | https://doi.org/10.1051/jp4:2006134004 | |
| Published online | 26 July 2006 | |
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 17-22
DOI: 10.1051/jp4:2006134004
Continuum mesoscale modelling of nanocrystalline fcc metals under shock-loading using an spectral formulation fed by molecular dynamics results
R.A. Lebensohn1, E.M. Bringa2 and A. Caro21 Los Alamos National Laboratory, Los Alamos, NM 87545, USA
2 Lawrence Livermore National Laboratory, CA 94550, USA
Published online: 26 July 2006
Abstract
In this paper we present a micromechanical approach based
on Fast Fourier Transforms to study the role played by dislocation glide and
grain boundary (GB) accommodation in the determination of the yield strength
of nanostructured materials under shock. For this, we construct unit cells
representing self-similar polycrystals with different grain sizes in the
nanometer range and use local constitutive equations for slip and grain
boundary accommodation. We study the effect of grain size and shock pressure
on the local and effective behavior of nanostructured fcc materials with
parameters obtained from experiments and atomistic simulations. Predictions
of a previous pressure-sensitive model for the effective yield strength
behind a shock front are improved by considering strain partition between
slip and GB activity.
© EDP Sciences 2006