Stretch Calculation

During the measurement cycle, for every single raw measurement, corresponding values of stress and strain are dynamically calculated according to regular stress/strain formulas. Due to these pair calculations, the list of corresponding stress-strain pairs are available at the end of the measurement. Such a list allows you to build the virtual stress-strain curve (see the illustration below).

The lower portion of the curve is almost linear; this part of the stress-strain curve represents proportional deformations that are most relevant for regular textile use in apparel. This means that typical loads applicable to garments during the use, causing proportional deformations, therefore analysis of this portion of the curve is most relevant.

Once the stress-strain curve is virtually built, the linear approximation of the lower portion of the curve is performed, providing you with the linear graph of proportional deformations (see the dotted line). The slope for this line is calculated and provided to user as a major characteristic of the fabric ability to resist linear deformations.