The use of Zylon fibers in ULDB tendons

Details The use of Zylon fibers in ULDB tendons The use of Zylon fibers in ULDB tendons

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004adspr..33.1736s&link_type=abstract

Advances in Space Research, Volume 33, Issue 10, p. 1736-1740.

Physics

Scientific Ballooning, Uldb Balloons, Zylon Fibres, Tendons

Scientific paper

Early in the development of the ultra long duration balloon (ULDB), Zylon was selected as the tendon material due to its favorable stress-strain properties. It is a next generation fiber whose strength and modulus are almost double those of the Kevlar fibers. In addition there are two versions of the Zylon, as spun (AS) and high modulus (HM). Data will be presented on why HM was chosen. Early in the development process, it was learned that this material exhibited an unusual sensitivity to degradation by ambient light. This is in addition to the expected sensitivity to UV (Ultraviolet) radiation. The fiber manufacturer reported all of these properties in their literature. Due to the operating environment of the ULDB it is necessary to protect the tendons from both visible and UV radiation. Methods to protect the tendons will be discussed. In addition, information on the long term exposure of the braided tendon over a thirty-two month period in a controlled manufacturing plant will be provided. Special testing methods will be noted.

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