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
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..View full abstract
Awarded by US Department of Energy
Awarded by US Department of Energy, Office of Science, Office of Basic Energy Sciences
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.