Fracture in disordered media is a central question in physics and mechanics. In cohesive granular systems, crack paths often exhibit irregular and complex geometries, ranging from multiscale patterns to structures with a characteristic wavelength. Understanding these processes is essential for industrial or natural examples, including the crack networks observed in snow avalanches or landslides. This internship project aims to perform laboratory experiments on an innovative cohesive granular material with tunable adhesion, in order to characterize crack initiation and propagation as a function of material cohesion. Using a three-point bending setup, we will determine the thresholds for crack nucleation, the scaling of fracture toughness, and the characteristic wavelengths or patterns emerging during propagation. High-resolution imaging and Digital Image Correlation (DIC) will be employed to monitor crack initiation and growth. These observations will be complemented by theoretical analysis using stability concepts and statistical physics. Depending on the candidate’s interests, possible extensions include connections to geophysical applications or numerical modeling.