  In this study, we report the mechanical properties and fracture mechanism of
pre-cracked and defected InSe nanosheet samples using molecular dynamics (MD)
simulations. We noticed that the failure of pre-cracked and defected InSe
nanosheet is governed by brittle type fracture. Armchair directional bonds
exhibit a greater resistance for crack propagation relative to the zigzag
directional ones. Thus, fracture strength of the pre-cracked sheet is slightly
higher for zigzag directional loading than that for armchair. We evaluated the
limitation of the applicability of Griffith's criterion for single layer (SL)
InSe sheet for nano-cracks as the brittle failure of Griffith prediction
demonstrates significant differences with the MD fracture strength. We
inspected the effect of temperature on the mechanical properties of the
pre-cracked samples of SLInSe. We also discussed the fracture mechanism of both
defected and pre-cracked structure at length.
