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To unravel how the microstructure affects the fracture surface roughness inheterogeneous brittle solids like rocks or ceramics, we characterized theroughness statistics of post-mortem fracture surfaces in home-made materials ofadjustable microstructure length-scale and porosity, obtained by sinteringmonodisperse polystyrene beads. Beyond the characteristic size of disorder, theroughness profiles are found to exhibit self-affine scaling features evolvingwith porosity. Starting from a null value and increasing the porosity, wequantitatively modify the self-affine scaling properties from anisotropic (atlow porosity) to isotropic (for porosity larger than 10 %).

Effect of the porosity on the fracture surface roughness of sintered materials: From anisotropic to isotropic self-affine scaling