Open AccessAnisotropic shock responses of nanoporous Al by molecular dynamics simulations
Author(s) -
Tian Xia,
Kaipeng Ma,
Guangyu Ji,
Junzhi Cui,
Yi Liao,
Meizhen Xiang
Publication year - 2021
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0247172
Subject(s) - void (composites) , nucleation , dislocation , materials science , molecular dynamics , anisotropy , nanoporous , shock (circulatory) , shock response spectrum , shock wave , slip (aerodynamics) , crystallography , condensed matter physics , physics , mechanics , composite material , thermodynamics , classical mechanics , chemistry , nanotechnology , optics , medicine , quantum mechanics , acceleration
Mechanical responses of nanoporous aluminum samples under shock in different crystallographic orientations (<100>, <111>, <110>, <112> and <130>) 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 <100> orientation; while for a relatively stronger shock, void collapses fastest in the <110> 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.