Abstract
It was observed that an additional increment in stress was necessary to continue deformation in nylon 66 filaments, which had been relaxed, but not unloaded, before fracture. This stress increment consisted of a small permanent increase in stress, in addition to a larger temporary increase in stress to yield. Both the temporary and permanent increments increased as the strain, strain rate, temperature and humidity increased. Similar effects were observed in other polymers, but not in metals or ceramics.
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References
A. V. Tobolsky, “Properties and Structure of Polymers” (New York, John Wiley & Sons, Inc.) (1960).
W. G. Hammerle andD. J. Montgomery,Text. Res. J. 23 (1953) 595.
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Phillips, W.L., Statton, W.O. Stress-relaxation hardening of nylon 66 filaments. J Mater Sci 5, 1021–1026 (1970). https://doi.org/10.1007/BF02403272
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DOI: https://doi.org/10.1007/BF02403272