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.
arXiv comment5 pages,3 figures. Accepted in the Physical Review Letters
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- Triggers and signatures of shear banding in steady and time-dependent flows
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