  This letter addresses the issue of interfacial crack propagation mechanisms
on various interfaces with using molecular dynamics. Four different interfacial
crack propagation manners are recognized by MD simulations: 1, the crack
propagates along the interface strictly; 2, the nucleation of a twinning at the
crack tip leads to the crack tip blunting; 3, the daughter crack appears ahead
of the main crack and then coalesces to the mother crack; 4, the crack tip
blunts with stacking fault nucleation at the crack tip. Furthermore, the
adhesive strength coefficient {\lambda}is used to identify the type of the
interface. Interface with {\lambda}> 0.9 means an ordered interface, and
interfacial crack propagates in mode I or mode II. While {\lambda}< 0.9
represents a disordered interface, and mode III and mode IV of the interfacial
cracks are preferred. This work illustrates the effect of adhesive strength of
interface on the mechanism of crack propagation along the interface of
metal/ceramics nano-composites.
