Effect of Temperature and Strain Rate on the Tensile Properties of Kevlar and PBI Yarns.

摘要

The tensile properties of Kevlar 29 and Kevlar 49, PRD-49 IV and PBI yarns were measured at low (0.167%/sec) and high (8000%/sec) strain rates over the temperature range -65 to 800 F. The effect of twist on tensile properties was determined also for Kevlar 29 and 49 yarns, as well as the knot and loop strengths of these yarns at various levels. Single fiber properties were measured for Kevlar 29 and Kevlar 49, including tensile properties, the effect of bending, twisting and lateral compression. Critical velocity under lateral impact and dynamic modulus was also determined. (Author).