MTS 709 Alignment System - Manual (Page 79)

709 Alignment System Specimen 79
Axial Boundary
This feature avoids the situation where the bending percent become infinite as the
axial strain gets very small (i.e. when zero load is applied). The default value is
200 µe.
When the axial strain is within this range, the bending percent will not be
calculated or displayed on the graph, so the text box and data file will show NaN
(Not a Number) for the bending percent. The Validation Status will show if the
data passes or fails the bending percent criteria only for the values that are
calculated. The Reports and the Validation Status will still agree because the NaN
will be shown where the bending percent is not calculated.
The bending percent is not plotted when the axial strain is within the boundary,
which will create a gap in the bending percent line. If the axial strain crosses over
the boundary to the other side, then the bending percent line will cross over the
boundary. The strain will still be plotted even if the axial strain is within the
boundary. When plotting strain and percent, the strain data point in the boundary
will not have a corresponding percent data point.