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Multiscale modeling of plasticity in a copper single crystal deformed at high strain rates

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Chandra S., Samal M. K., Chavan V. M., Patel R. J.

Plasticity and Mechanics of Defects

2015

vol. 1

issue 1

A hierarchical multiscale modeling approach is presented to predict the mechanical response of dynamically deformed (1100 s−1−4500 s−1) copper single crystal in two different crystallographic orientations.Anattempt has been made to bridge the gap between nano-, micro- and meso- scales. In view of this, Molecular Dynamics (MD) simulations at nanoscale are performed to quantify the drag coefficient for dislocations which has been exploited in Dislocation Dynamics (DD) regime at the microscale. Discrete dislocation dynamics simulations are then performed to calculate the hardening parameters required by the physics based Crystal Plasticity (CP) model at the mesoscale. The crystal plasticity model employed is based on thermally activated theory for plastic flow. Crystal plasticity simulations are performed to quantify the mechanical response of the copper single crystal in terms of stressstrain curves and shape changes under dynamic loading. The deformation response obtained from CP simulations is in good agreement with the experimental data.

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1 Plasticity and Mechanics of Defects

1 2015

1 Chandra S.

1 Chavan V. M.

1 Patel R. J.

1 Samal M. K.

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Multiscale modeling of plasticity in a copper single crystal deformed at high strain rates