5.6.4 Slope (Modulus) Fit Algorithm The automatic Slope Fit algorithm uses a least square fit between the two scope locations that you define on your graph. The Slope Fit algorithm uses the first data point and maximum load point and then divides the data into equal regions with no overlap. A least squares fit is applied to all points in each region to determine the individual slopes within the region. The region with the highest slope is assigned the slope on which elastic is determined.
5.6.4.1 Slope Fit Scope The scope for the automatic fit slope is based on two specific points that defined the end points of a line segment. One point is the maxi- mum load value on the curve. As you position the scope handles, the green line representing the modulus repositions itself along the curve. You can adjust the scope handles or enter the start and ending values in the Data Definition menu for the two-point slope algorithm. The elastic is calculated within the segment.
Max Slope & Slope Fit
Slope Measurement Tools
The modulus line (green) is constructed within the scope range.
The blue line represents the line segment used to determine the greatest slope.
The scope range was specified by moving the scope handles along the x-axis until the two existing markers changed to yellow color indicating they are anchored.
Slope Fit Shows elastic using entire data stream
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