Effects of Non-local Stress on the Determination of Shear Banding Flow

Details Effects of Non-local Stress on the Determination of Shear Banding Flow Effects of Non-local Stress on the Determination of Shear Banding Flow

1999-11-26

arxiv.org/abs/cond-mat/9911425v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 Postscript figures, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.84.642

We analyze the steady planar shear flow of the modified Johnson-Segalman model, which has an added non-local term. We find that the new term allows for unambiguous selection of the stress at which two ``phases'' coexist, in contrast to the original model. For general differential constitutive models we show the singular nature of stress selection in terms of a saddle connection between fixed points in the equivalent dynamical system. The result means that stress selection is unique under most conditions for space non-local models Finally, illustrated by simple models, we show that stress selection generally depends on the form of the non-local terms (weak universality).

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