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Long term elongation of Kevlar-49 single fiber at low temperature.

Author(s) : BERSANI A., CANONICA L., CARIELLO M., et al.

Type of article: Article

Summary

We have measured the rate of elongation of a loaded Kevlar-49 fiber as a function of time at 4.2 K. The result puts a worst case upper limit of 0.028% in the elongation rate ?L/L for a 0.5 mm diameter fiber kept under a constant tension of 2.7 kg for 8 months. A value that is probably closer to reality is actually 0.004%. This result proves that Kevlar-49 can be safely used in cryogenic applications in which high mechanical stability under stress is required.

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