Intermittency and roughening in the failure of brittle heterogeneous materials

Details Intermittency and roughening in the failure of brittle heterogeneous materials Intermittency and roughening in the failure of brittle heterogeneous materials

2009-07-20

arxiv.org/abs/0907.3353v2

Journal of Physics D 42, 214014 (2009)

Physics

Condensed Matter

Statistical Mechanics

38 pages, invited review for J. Phys. D cluster issue on "Fracture: from the Atomic to the Geophysics Scale"

Scientific paper

10.1088/0022-3727/42/21/214014

Stress enhancement in the vicinity of brittle cracks makes the macro-scale failure properties extremely sensitive to the micro-scale material disorder. Therefore: (i) Fracturing systems often display a jerky dynamics, so-called crackling noise, with seemingly random sudden energy release spanning over a broad range of scales, reminiscent of earthquakes; (ii) Fracture surfaces exhibit roughness at scales much larger than that of material micro-structure. Here, I provide a critical review of experiments and simulations performed in this context, highlighting the existence of universal scaling features, independent of both the material and the loading conditions, reminiscent of critical phenomena. I finally discuss recent stochastic descriptions of crack growth in brittle disordered media that seem to capture qualitatively - and sometimes quantitatively - these scaling features.

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