Determining True Material Constants of Semisolid Slurries from Rotational Rheometer Data

Andreas N. Alexandrou; Georgios C. Georgiou; Eva-Athena Economides; Michael Modigell

doi:10.4028/www.scientific.net/SSP.256.153

Paper Titles

Rheological Behavior and Fluidity of Semi-Solid SiCp/A357 Composites with Different SiC Addition Levels
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Rheological Properties of Liquid Metals and Semisolid Materials at Low Solid Fraction
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Application of Multiphase Modelling in Semi-Solid Die Casting: Blister Prediction
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Behaviour of Semisolid Slurry Flows through a Channel
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Determining True Material Constants of Semisolid Slurries from Rotational Rheometer Data
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Liquid-Solid Microextrusion of Aluminum Alloy
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Microstructure and Mechanical Properties of AIN Particles Reinforced Magnesium Matrix Composites with In Situ Synthesis Process
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Microstructure and Properties of LPSO Phase Reinforced Mg Alloy Produced by Rheocasting
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Controlling and Minimizing Blistering during T6 Heat Treating of Semi-Solid Castings
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Determining True Material Constants of Semisolid Slurries from Rotational Rheometer Data

Abstract:

In this work we revisit the issue of obtaining true material constants for semisolid slurries. Therefore, we consider the circular Couette flow of Herschel-Bulkley fluids. We first show how true constants can be obtained using an iterative procedure from experimental data to theory and vice versa. The validity of the assumption that the rate-of-strain distributions across the gap share a common point is also investigated. It is demonstrated that this is true only for fully-yielded Bingham plastics. In other cases, e.g., for partially-yielded Bingham plastics or fully-yielded Herschel-Bulkley materials, the common point for the fully-yielded Bingham case provides a good approximation for determining the material constants only if the gap is sufficiently small. It can thus be used to simplify the iterative procedure in determining the material constants.