Structural Signature of a Brittle-to-Ductile Transition in Self-Assembled Networks Auteur(s): Ramos L., Laperrousaz Arnaud, Dieudonne-George P., Ligoure C. (Article) Publié: Physical Review Letters, vol. 107 p.148302 (2011) Texte intégral en Openaccess : Ref HAL: hal-00628223_v1 DOI: 10.1103/PhysRevLett.107.148302 WoS: 000296285800029 Exporter : BibTex | endNote 13 Citations Résumé: We study the nonlinear rheology of a novel class of transient networks, made of surfactant micelles of tunable morphology reversibly linked by block copolymers. We couple rheology and time-resolved structural measurements, using synchrotron radiation, to characterize the highly nonlinear viscoelastic regime. We propose the fluctuations of the degree of alignment of the micelles under shear as a probe to identify a fracture process. We show a clear signature of a brittle-to-ductile transition in transient gels, as the morphology of the micelles varies, and provide a parallel between the fracture of solids and the fracture under shear of viscoelastic fluids. |