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The Yield Stress - A New Point of View. Letter to Editors.

Appl. Rheol.13:4 (2003) 209-211 ►

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Hadjistamov D: The Yield Stress - A New Point of View. Letter to Editors., Appl. Rheol. 13 (2003) 209.

The rheological behavior of model suspensions with the silicone oil M20000 and different concentrations of Cab-o-sil TS 720 resp. Durcal 5 are compared. The increase of the Cab-o-sil concentration changes the flow behavior of the suspension from shear-thinning, to pseudoplastic, and to plastic flow behavior. The first normal stress difference rises at the same time at certain shear rate. The disperse systems with Durcal 5 keep the structural viscous behavior of the silicone oil even with a filler concentration of 40.5 wt%. The dependence of the first normal stress difference on shear rate represents for suspensions with Durcal 5 only one straight line with a slope of n = 2. The normal stress has double the amount of the silicone oil M20000 at given shear rate and is independent of the used Durcal 5 concentration. It was established that suspensions with the silicone oil M20000 have a first normal stress difference that can, depending on the filler type, either increase (with Cab-o-sil TS 720) or decrease (with Durcal 5) at certain shear stress with increasing filler concentration. It is to be supposed that the decrease of the normal stress at a given shear stress, with increasing Durcal concentration, is a softening effect, caused by the filler.► Cite this publication as follows:

Hadjistamov D: Viscoelastic Behavior of Disperse Systems with Silicone Oil and Different Fillers, Appl. Rheol. 12 (2002) 297.

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Hadjistamov D: Dilatant Behavior of Systems with the Thixotropic Agent Aerosil 380 in the, Appl. Rheol. 9 (1999) 212.

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Hadjistamov D: Dependance of the First Normal Stress Difference of Silicone Oils on Zero-Shear Viscosity and Molecular Weight, Appl. Rheol. 6 (1996) 203.

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Hadjistamov D: Relationship between the Normal Stress Difference and the Shear Stress, Appl. Rheol. 5 (1995) 29.

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Hadjistamov D, Gutekunst F: Capabilities and Limits of the Press Flow Method, Appl. Rheol. 4 (1994) 29.D Hadjistamov

Viscoelastic Properties of Filled Silicone Fluids

Appl. Rheol.3:2 (1993) 113 ►

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Hadjistamov D: Viscoelastic Properties of Filled Silicone Fluids, Appl. Rheol. 3 (1993) 113.

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