Depinning transition and scaling of fracture surfaces: the crucial role of disorder
Résumé
Can we describe crack propagation as a critical transition ? Such a description would bring the possibility of material-independent predictions for the fracture behavior of heterogeneous materials. Early attempts to model the propagation of a crack front as a depinning line in a random media have apparently failed thus far to reproduce quantitatively the experimental data obtained on fracture surfaces. The ability of designing model heterogeneous materials with a tunable nanos- tructure lengthscale (phase separated glasses) allows us to observe, that actually, the predictions of depinning models give a correct description of crack propagation: the roughness of fracture surfaces is shown to obey a logarithmic scaling beyond the characteristic size of disorder.
Domaines
Autre [cond-mat.other]Origine | Fichiers produits par l'(les) auteur(s) |
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