Harmonic analysis in rheological property measurement |
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Authors: | Thomas E Karis C Mark Seymour Raymond N Kono Myung S Jhon |
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Institution: | (1) IBM Research Division Almaden Research Center San Jose, CA 95120, USA e-mail: karis@almaden.ibm.com, US;(2) Department of Chemical Engineering Carnegie Mellon University Pittsburgh, PA 15213, US |
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Abstract: | Sudden change in the linear stress-strain relationship has long been known to produce interesting discontinuities in the
flow properties of polymer melts, concentrated particle suspensions, and gels as the shear rate amplitude is increased. The
non-linear effect produces stress harmonics, which contain information about the material properties that is otherwise difficult
to obtain. This note describes a generalized procedure for extracting yield stress material functions from the discrete Fourier
transform of the stress signal.
Received: 23 April 2001 Accepted: 27 July 2001 |
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Keywords: | Harmonic analysis Pseudo-Newtonian fluid Yield stress Rheological measurement Bingham fluid Fourier transform analysis |
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