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A number of testing techniques are available for measuring and analyzing the yield stress using a rheometer. Three of these techniques, including Steady Stress Sweep (SS), Steady Rate Sweep from High to Low Shear Rates (SR), and Dynamic Stress/Strain Sweep (DS) are introduced in this paper.
The controlled stress approach provides three alternative experimental methods for determining apparent yield stress: (1) Stress can be ramped slowly from zero to some higher value. The stress level at which motion first occurs is the apparent yield stress.
This presentation explains and discusses the various approaches available to measure yield stress, and aspects of the practical measurement set-up and test parameters that need to be considered to obtain relevant, robust and reliable yield stress data using a rotational rheometer.
1 Δεκ 2016 · Abstract. Yield stress materials are ubiquitous, yet the best way to obtain the value of the yield stress for any given material has been the subject of considerable debate. Here we compare different methods of measuring the yield stress with conventional rheometers that have been used in the literature on a variety of materials.
1 Οκτ 2023 · A sensitivity analysis is conducted to assess the effects of the variations in YPL fluid rheological properties (i.e., YPL model parameters estimated by using different rheological characterization techniques) on the predictions of frictional pressure loss in the pipe flow of YPL fluids.
slump test offers a quick and easy way of measuring yield stress without the need for sophisticated electronic equipment, thereby giving plant operators an effective tool for determining yield stress.
what is termed a yield stress, where below some critical stress, the viscosity becomes infinite and hence character-istic of a solid. This type of flow response is known as plas-tic flow and is characterized by an ever increasing viscosity as the shear rate approaches zero (no visible plateau).
