Abstract
The breaking stress (BS), breaking extension (BE), initial modulus (IM), torsional modulus (TM) and breaking twist angle (BTA) of a wide range of fibers were determined. The fibers included high performance and industrial fibers whose BTA values had not been determined previously. BTA, as a measure of brittleness, evaluates fiber properties under shear rather than tensile stress and the relationships between BTA and BE and also IM were developed. IM/TM is a measure of the lengthwise to lateral cohesiveness of a fiber and is shown to correlate highly with breaking stress. The effects of chemical and fine structure on the measured mechanical properties of the fibers are discussed.
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