Journal article

Effect of loading direction on grain boundary failure under shock loading

SJ Fensin, JP Escobedo-Diaz, C Brandl, EK Cerreta, GT Gray, TC Germann, SM Valone

ACTA MATERIALIA | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2014

Abstract

We investigate the effect of grain boundary inclination with respect to the loading direction on void nucleation at a boundary, using plate impact experiments on polycrystalline copper. Examination of damaged specimens reveals that boundaries perpendicular to the loading direction are an order of magnitude more susceptible to failure than those parallel to the loading direction. We investigate the mechanisms and reasons behind this experimental observation through molecular dynamics (MD) simulations, as a function of loading direction, in a copper bicrystal. Two extremes of loading directions are considered, either parallel or perpendicular to the grain boundary plane, spanning the range tha..

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University of Melbourne Researchers

Grants

Awarded by US Department of Energy


Awarded by US Department of Energy, Office of Science, Office of Basic Energy Sciences


Funding Acknowledgements

Los Alamos National Laboratory is operated by LANS, LLC, for the NNSA and the US Department of Energy under contract DE-AC52-06NA25396. The work of S.J.F., C.B., E.K.C., T.C.G. and S.M.V. was supported by the Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number 2008LANL1026. The authors would also like to thank Jian Wang for helpful discussions.