Apparent Fracture in Polymeric Fluids under Step Shear
arXiv:1204.4169 · doi:10.1103/PhysRevLett.110.204503
Abstract
Recent step strain experiments in well-entangled polymeric liquids demonstrated a bulk fracture-like phenomenon. We have studied this instability using a modern version of the Doi-Edwards theory for entangled polymers, and we find close quantitative agreement with the experiments. The phenomenon occurs because the viscoelastic liquid is sheared into a rubbery state that possesses an elastic constitutive instability (Marrucci and Grizzuti, 1983). The fracture is a transient manifestation of this instability, which relies on the amplification of spatially inhomogeneous fluctuations. This mechanism differs from fracture in glassy materials and dense suspensions.
5 pages,3 figures. Accepted in the Physical Review Letters
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- Shear banding in time-dependent flows of polymers and wormlike micelles
- Triggers and signatures of shear banding in steady and time-dependent flows
- Emergence and persistence of flow inhomogeneities in the yielding and fluidization of dense soft solids
- Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of polymers and wormlike micelles
- Transient shear banding in the nematic dumbbell model of liquid crystalline polymers