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Article Dans Une Revue Physical Review Letters Année : 2008

Magic angles and cross-hatching instability in hydrogel fracture

Résumé

The full 2D analysis of roughness profiles of fracture surfaces resulting from quasistatic crack propagation in gelatin gels reveals an original behavior characterized by (i) strong anisotropy with maximum roughness at V-independent symmetry-preserving angles and (ii) a subcritical instability leading, below a critical velocity, to a cross-hatched regime due to straight macrosteps drifting at the same magic angles and nucleated on crack-pinning network inhomogeneities. Step height values are determined by the width of the strain-hardened zone, governed by the elastic crack blunting characteristic of soft solids with breaking stresses much larger than low strain moduli.

Dates et versions

hal-01280964 , version 1 (01-03-2016)

Identifiants

Citer

T. Baumberger, C. Caroli, D. Martina, O. Ronsin. Magic angles and cross-hatching instability in hydrogel fracture. Physical Review Letters, 2008, 100 (17), pp.178303. ⟨10.1103/PhysRevLett.100.178303⟩. ⟨hal-01280964⟩
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