Abstract
This paper examines the reliability of estimating from slow-speed extension-recovery curves the dynamic properties of nylon filaments and yarns, such as the sonic velocity and the retraction velocity on the sudden release of tension. From the slope of the strain-recovery curve near to the point of reversal of loading, it is estimated that the sonic velocity would be about 2700 m/sec at a fibre tension of 0.1 N but rise to 6000 m/sec near the breaking tension. By direct measurement on a Morgan Dynamic Modulus Tester, a sonic velocity of 2800 m/sec is obtained at all tensions below 0.2 N, but, above this value, it rises linearly with tension to about 4000 m/sec near break. The retraction velocity from 15% extension on the total release of tension is about 220 m/sec on the basis of the complete conversion of strain energy to fibre kinetic energy. An alinear elastic theory gives a similar result when estimates from slow-speed recovery curves are used but a higher value when the directly measured sonic velocity is used.
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