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

Intermittency and roughening in the failure of brittle heterogeneous materials