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Accueil > Publications > Archives 2004-2010 > 2008

Shear-induced fractures and three-dimensional motions in an organogel

P. Grondin, S. Manneville, J.-L. Pozzo, and A. Colin — Phys. Rev. E 77, 011401 (2008)

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The flow behavior of a viscoelastic organogel is investigated using ultrasonic velocimetry combined with
rheometry. Our gel presents a decreasing flow curve, i.e., the measured stress decreases as a function of the
applied shear rate. Strikingly, we note that the local flow curve calculated from the velocity profiles also
exhibits a decreasing part. We attribute this regime to the presence of a fracturing process and threedimensional
motions in the bulk of the sample.