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The tensile properties of textile yarns at very high strain rates
Author(s) -
Hall I. H.
Publication year - 1964
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1964.070080115
Subject(s) - materials science , composite material , strain rate , ultimate tensile strength , stress (linguistics) , textile , modulus , fiber , polymer , philosophy , linguistics
Stress‐strain curves have been determined at a very high rate (330 sec. −1 ) and at a normal rate (8.3 × 10 −3 sec. −1 ) of straining for a range of lightly twisted yarns covering all commercially important fiber‐forming polymers. From these curves breaking stress and extension, energy to rupture, initial modulus, and critical velocity have been obtained. Results are presented in detail to assist selection of fibers for applications where rapid extension is likely. At the high rate the breaking stress is always greater and, with one exception, the breaking extension less than at normal rates. The energy to rupture increases with rate for the wet‐spun fibers and, with one exception, decreases for the thermoplastic. The variation in magnitude of these changes is considerable even among fibers from the same polymeric base, emphasizing the importance of testing at a rate comparable to that encountered in use. Similar experiments performed with three of the yarns highly twisted showed that the ranking of the yarns according to a particular property could be altered by the insertion of twist. The stress‐strain curves of the material were used to predict the curves for the twisted yarn, following a theory of Treloar and Riding. At the normal rate agreement with experiment was fairly good, but it was much worse at the high rate.