Fracture of a biopolymer gel as a viscoplastic disentanglement process
UMR 7588, Campus Boucicaut, INSP, Université Pierre et Marie Curie-Paris 6, Université Denis Diderot-Paris 7, CNRS, 140 rue de Lourmel, 75015, Paris, France
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Accepted: 12 October 2006
Published online: 9 November 2006
We present an extensive experimental study of mode-I, steady, slow crack dynamics in gelatin gels. Taking advantage of the sensitivity of the elastic stiffness to gel composition and history we confirm and extend the model for fracture of physical hydrogels which we proposed in a previous paper (Nature Mater. 5, 552 (2006)), which attributes decohesion to the viscoplastic pull-out of the network-constituting chains. So, we propose that, in contrast with chemically cross-linked ones, reversible gels fracture without chain scission.
PACS: 62.20.Mk Mechanical properties of solids: Fatigue, brittleness, fracture, and cracks – / 83.80.Kn Physical gels and microgels – / 83.60.La Viscoplasticity; yield stress –
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2006