Effects of constituting material and interfacial crack on mechanical response of nanoscale metallic bilayers - a quasi-continuum study
C.-D. Wu, T.-H. Fang, W.-C. Su and Y.-C. Fan
Molecular Simulation, 46, 1155-1163 (2020).

ABSTRACT
The effects of the constituting material and an interfacial crack on the
deformation and mechanical response of metallic bilayer films under tension are
studied using quasi-continuum simulations in terms of atomic trajectories,
stress distribution and the stress-strain curve. The simulation results show
that bilayer films with identical constituting monolayers have higher tensile
strength than that of those with different monolayers. For bilayer films with
different monolayers, the layer interface acts as a barrier that resists
dislocation propagation. Dislocation emission at a crack tip blunts the tip.
Necking originates at the layer interface and develops on monolayers with
relatively low strength. A rectangular crack is less likely to develop than a
V-shaped crack.