5.6.2 Tangent Slope Algorithm The tangent slope or initial tangent is the slope of the line drawn tan- gent to a point or leg on the load-distance curve. The tangent slope is useful in describing the behavior of materials that have been stressed beyond the elastic region and that exhibit curves that make other types of modulus determination difficult.
5.6.2.1 Leg Length The Leg Length establishes how many data points on either side of the tangent point are used to calculate the slope line. A leg length is used since a slope line cannot be drawn based on a single point. The greater the value of the leg length, the more data points are used to draw the modulus and to obtain the result. NOTE The greater the leg length, the greater the number of data points are used to establish the slope line. When the leg length = 19, 9 data points on either side of your reference point are used to construct the modulus line. 5.6.2.2 Tangent Slope Scope The scope for tangent slope is based on a specific point and a specified leg length. As you position the scope handle, you will notice that the blue line segment created using the leg length changes to highlight the data representing the greatest slope.
The tangent slope is determined at a point on the curve and by the user defining a Leg Length.
Tangent Slope
Slope Measurement Tools
The elastic is 6736.30 Mpa.
The modulus line (green) is constructed along the curve and is scope from the Strain point at 0.942%. The Leg Length of 19 creates a line segment with 9 points on either side of the Strain point. This draws the modulus line.
The x-axis (Distance) is used for scope.
Tangent Slope Shows elastic at tangent point
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