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Nano Lett. 2012 Sep 12;12(9):4605-10. doi: 10.1021/nl301908b. Epub 2012 Aug 13.

Flaw insensitive fracture in nanocrystalline graphene.

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School of Engineering, Brown University, Providence, Rhode Island 02912, United States.


We show from a series of molecular dynamics simulations that the tensile fracture behavior of a nanocrystalline graphene (nc-graphene) nanostrip can become insensitive to a pre-existing flaw (e.g., a hole or a notch) below a critical length scale in the sense that there exists no stress concentration near the flaw, the ultimate failure does not necessarily initiate at the flaw, and the normalized strength of the strip is independent of the size of the flaw. This study is a first direct atomistic simulation of flaw insensitive fracture in high-strength nanoscale materials and provides significant insights into the deformation and failure mechanisms of nc-graphene.

[Indexed for MEDLINE]

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