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 ΔL/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.
Bersani, A., Canonica, L., Cariello, M., Cereseto, R., Di Domizio, S., Pallavicini, M. (2013). Long term elongation of Kevlar-49 single fiber at low temperature. CRYOGENICS, 54, 50-53 [10.1016/j.cryogenics.2012.10.005].
Long term elongation of Kevlar-49 single fiber at low temperature
Canonica L
;
2013
Abstract
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 ΔL/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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