EVALUATION OF YIELD STRESS MEASUREMENT TECHNIQUES ON A PARALLEL PLATE MAGNETIC RHEOMETER

Author:

ULICNY JOHN C.1,GOLDEN MARK A.2

Affiliation:

1. General Motors R&D and Planning, 30500 Mound Road, Warren, Michigan 48090, USA

2. General Motors R&D and Planning, 30500 Mound Road, Warren, MI 48090, USA

Abstract

The on-state yield stress is the primary design parameter for an MR actuator. We have evaluated several methods for measuring yield stress on a number of MR fluids of varying composition using a commercial parallel plate magnetic rheometer. The data obtained by these methods is evaluated for reproducibility and sensitivity to sample size variation and is compared against data obtained with a concentric cylinder magnetic rheometer and literature results. Based on these evaluations and comparisons, we selected two tests for further evaluation.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

Reference4 articles.

1. R. B. Bird, W. E. Stewart and E. N. Lightfoot, Transport Phenomena (John Wiley & Sons, Inc., New York, 1960) p. 11.

2. T.G. Mezger, The Rheology Handbook (Vincentz Verlag, Hannover, Germany, 2002) p. 45.

3. Design and Experimental Evaluation of a Magnetorheological Brake

4. H.A. Barnes, A Handbook of Elementary Rheology, The University of Wales Institute of Non-Newtonian Fluid Mechanics, Department of Mathematics (University of Wales Aberystwyth, Penglais, Aberystwyth, Dyfed, Wales) p. 125.

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