MTS Multipurpose Elite - Manual (Page 246)

Returns
The function returns the index associated with the start of the Yield Point Elongation region.
Syntax
YpeStartIndex(ForceArray, DisplacementArray, Angle, SegmentLength, YieldIndex)
Parameters
ForceArray - The force array being analyzed for the Yield Point Elongation region.
DisplacementArray - The displacement array being analyzed for the Yield Point Elongation region.
Angle - The angle which must be exceeded.
SegmentLength - Percentage of points to use in the slope calculations.
YieldIndex - The index point into the array where the Yield Index was determined.
Unit Class
Integer
Example
Angle = 0
SegmentLength = 2%
YieldIndex = 85
Total points on the curve = 200
Number of points in segment = 0.02 * 200 = 4 points
1. Start with the segment from point 85 to point 89.
2. Increment points until slope is less than zero. For this example, assume that this occurs at points 100
to 104.
3. Increment points starting at 100 to 104 until the slope value is greater than zero. For our example,
assume this occurs at points 105 to 109.
4. Report the YPE Start Index as the minimum load point between the Yield index and the last point of
the search (point 109).
Math Functions
This section provides reference information about the math functions.
abs (Absolute Value)
This function is used to calculate the absolute value of the number specified.
246 | MTS TestSuite
Working with Variables