Magic Angles in Fracture Surface Morphologies of Gelatin Hydrogels

Tristan Baumberger (1) , Christiane Caroli (1) , David Martina (1) , Olivier Ronsin (1)

1 INSP - Institut des Nanosciences de Paris

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]

Tristan Baumberger, Christiane Caroli, David Martina, Olivier Ronsin. Magic Angles in Fracture Surface Morphologies of Gelatin Hydrogels. 2008. ⟨hal-00203366⟩