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3.3.6.4.11) “Yield stress” (YS) using a straight line through two measuring points

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Preparation of a flow curve diagram with DR on the y-axis and the speed n on the x-axis (both on a linear scale). The two measuring points are plotted: (DRH; nH) and (DRL; nL) showing the values from the end of the two test intervals. A straight line is drawn through the two points, and then extrapolated towards n = 0. YS is the point at which this line crosses the y-axis (or DR-axis, respectively).

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