Atomistic modelling of butterflies

Atomistic modelling of crack growth in ferrite can produce very beautiful pictures, reproducing the observed butterfly shape of cracks which occurs as a result of fatigue.

http://iopscience.iop.org/0965-0393/20/7/075004/article

I like this picture very much, it looks just like a sketch but it is the result of calculation. Green corresponds to regions of high stress.
Very nice picture representing atomistic simulation results, which looks just like a sketch.
Snapshot from a simulation of the penny-shaped crack in a {1 1 0} plane, clearly showing how the dislocation loops emitted in {1 1 2}〈1 1 1〉 slip systems resemble butterfly wings. The coloring of the atoms is carried out due to von Mises stress, where blue is low and green is high stress, respectively.

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