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Long term elongation of Kevlar-49 single fiber at low temperature
Affiliation:1. INFN – Sezione di Genova, Genova I-16146, Italy;2. Dipartimento di Fisica, Università di Genova, Genova I-16146, Italy;1. Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing 100191, PR China;2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, PR China;3. China Academy of Machinery of Science & Technology, Beijing 100044, PR China;1. Department of Physics, University of California, Santa Barbara, CA 93106-9530, United States;2. Department of Physics, University of California, Berkeley, CA 94720-7300, United States;3. Department of Physics, University of California, Davis, CA 95616-8677, United States;4. Department of Mechanical Engineering, University of Colorado, Boulder 80309-0427, United States;5. Materials Science and Engineering Program, University of Colorado, Boulder 80303-7817, United States;1. Department of Electrical Engineering and Information Technology, University of Naples Federico II, Naples, Italy;2. European Organization for Nuclear Research (CERN), Geneva, Switzerland;3. Instituto Superior Tecnico, University of Lisbon, Lisbon, Portugal;4. STFC Daresbury Laboratory, Warrington, UK;1. NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA;2. Bastion Technologies, 7515 Mission Drive, Suite 300, Lanham, MD 20706, USA;3. SGT Inc., 7701 Greenbelt Road, Suite 400, Greenbelt, MD 20770, USA;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, PR China;2. School of Materials Science and Engineering, School of Aerospace Engineering, Shenyang Aerospace University, Shenyang, Liaoning 110136, PR China;3. School of Engineering and Technology, University of Hertfordshire, Hertfordshire, England, United Kingdom
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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