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Defects in solid commonly limit mechanical performance of the material.However, recent measurements reported that the extraordinarily high strength ofgraphene is almost retained with the presence of grain boundaries. We clarifyin this work that lattice defects in the grain boundaries and distortedgeometry thus induced define the mechanical properties characterized underspecific loading conditions. Atomistic simulations and theoretical analysisshow that tensile tests measure in-plane strength that is governed bydefect-induced stress buildup, while nanoindentation probes local strengthunder the indenter tip and bears additional geometrical effects from warping.These findings elucidate the failure mechanisms of graphene under realisticloading conditions and assess the feasibility of abovementioned techniques inquantifying the strength of graphene, and suggest that mechanical properties oflow-dimensional materials could be tuned by implanting defects and geometricaldistortion they leads to.

Role of defects and geometry in the strength of polycrystalline graphene