Fuse network model of a fracture showing backbone fracture in black, dangling ends in red, and other, unconnected, cracks in blue.

From the article:

Fracturing Highly Disordered Materials
A. A. Moreira, C. L. N. Oliveira, A. Hansen, N. A. M. Araújo, H. J. Herrmann, and J. S. Andrade, Jr.
Phys. Rev. Lett. 109, 255701 (2012)

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