Rheological Behavior Identification of Materials from Oscillatory Shear
Keywords:Oscillatory shear; Rheological behavior identification; Ewoldt grid; Pipkin diagram
The objective of this article is to report how to identify the rheological behavior of material from oscillatory shear testing which is a wildly used method to classify material. This article uses official functions announced by the Society of Rheology (SOR) to acquaint those researchers. An oscillatory shear flow can be classified by its shear strain. For small shear strain, i.e. at small Weissenberg number Wi < 1, the flow is called small amplitude oscillatory shear, SAOS in which the stress in the fluid is a linear function of the shear strain. However, for large shear strain, Wi > 1, such flow can be classified as a large amplitude oscillatory shear, LAOS, flow where the shear stress can be described by Fourier series of the shear strain. Lastly, any oscillatory flow can be written in complex functions, which very useful for dynamic mechanical analysis. Up until now, Ewoldt grid on Pipkin diagram is the most widely used method for researchers to classify material behaviors.
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