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Single Crystal Deformation Experiments for Validation of Dislocation Dynamics Simulations

Published online by Cambridge University Press:  15 February 2011

David H. Lassila,
Mary M. LeBlanc and
Moono Rhee
David H. Lassila
Affiliation:
Lawrence Livermore National Laboratory, P.O. Box 808 L-113, Livermore, CA 94551-0808.
Mary M. LeBlanc
Affiliation:
Lawrence Livermore National Laboratory, P.O. Box 808 L-113, Livermore, CA 94551-0808.
Moono Rhee
Affiliation:
Lawrence Livermore National Laboratory, P.O. Box 808 L-113, Livermore, CA 94551-0808.
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Abstract

A new experimental apparatus has been developed for performing compression deformation experiments on high-purity Mo single crystals. These experiments provide data that can validate 3-D dislocation dynamics (DD) simulations. The experiments are performed under conditions that allow unconstrained deformation; thus, a relatively uniform state of axial stress is maintained during deformation. In the following sections, we describe the new experimental apparatus and our results from experiments performed at ambient temperature at a strain rate of s–1. Validation criteria based on the Mo experiments may include comparing the stress-strain response using 3-D strain information, the predicted slip-system yield, and work-hardening behavior.

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