Anisotropic shock responses of nanoporous Al by molecular dynamics simulations

X Tian and KP Ma and GY Ji and JZ Cui and Y Liao and MZ Xiang, PLOS ONE, 16, e0247172 (2021).

DOI: 10.1371/journal.pone.0247172

Mechanical responses of nanoporous aluminum samples under shock in different crystallographic orientations (, , , and ) are investigated by molecular dynamics simulations. The shape evolution of void during collapse is found to have no relationship with the shock orientation. Void collapse rate and dislocation activities at the void surface are found to strongly dependent on the shock orientation. For a relatively weaker shock, void collapses fastest when shocked along the orientation; while for a relatively stronger shock, void collapses fastest in the orientation. The dislocation nucleation position is strongly depended on the impacting crystallographic orientation. A theory based on resolved shear stress is used to explain which slip planes the earliest-appearing dislocations prefer to nucleate on under different shock orientations.

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