Fracture of a biopolymer gel as a viscoplastic disentanglement process |
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Authors: | T Baumberger C Caroli D Martina |
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Institution: | (1) 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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Abstract: | 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. |
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Keywords: | 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 |
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