Some Dynamic Properties of Filamentous Materials

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Abstract
A testing apparatus is described in which the chain-weight principle is used for the purpose of a slow and continuous load application as well as load removal. The elongation can be read with precision with the aid of a micrometer device and an indicator which has an attachment for practically eliminating parallactic errors. Readings are taken in the state of substantial equilibrium of load-versus-extension. With this machine it is possible to give special consideration to such critical points as the yield point. The instrument lends itself readily, furthermore, to the determination of hysteresis loops and also to the investigation of crimp in yarns. Reliable data are given of load extension curves of representative synthetic yarns. In addition to taking the stretch-versus-tension diagrams, as such, the hysteresis loops are determined for various points of the loadstrain curve and their theoretical and practical importance is discussed. The measurements taken of textile yarns are compared to the load extension characteristics of metals and the results are discussed in exact physical terms. The dynamic characteristics of sized yarn are discussed. The limitations of crimpage measurements are mentioned.

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