Magic Angles in Fracture Surface Morphologies of Gelatin Hydrogels
Résumé
The full 2D analysis of roughness profiles of fracture surfaces resulting from quasi-static crack propagation in gelatin gels reveals an original behavior characterized by (i) strong anisotropy with maximum roughness at $V$-independent symmetry-preserving angles (ii) For crack velocities $V$ below a critical value, a cross-hatched regime due to straight macrosteps drifting at the same magic angles (iii) A marked increase with $V$ of average roughness amplitude. This, together with previous results on other highly compliant, tough, polymeric networks, leads us to propose the existence of a new class of morphologies, controlled primarily by elastic non-linearities.
Domaines
Matière Molle [cond-mat.soft]Origine | Fichiers produits par l'(les) auteur(s) |
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