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ASTM D2256

Standard Test Method for Tensile Properties of Yarns by the Single-Strand Method

This method covers the testing of tensile properties of monofilament, multifilament, and spun yarns.

After proper conditioning, the technician sets the machine to the appropriate starting gauge length as per the ASTM standard.  The specimen is fitted onto the grips, the fiber tex and/or diameter are entered and the testing begins.  The technician will remove the broken pieces, attach them to each other, and clearly indicate which end is the fractured end.  Multiple tests will be performed to determine variability.

Breaking force, breaking tenacity, elongation, initial modulus, chord modulus, breaking toughness.

Equipment used:
Test frame, pneumatic cord and yarn grips, pneumatic foot switch, test method software.