Design considerations for stretch conductors in oceanographic moorings
Citable URI
https://hdl.handle.net/1912/517DOI
10.1575/1912/517Abstract
A copper conductor formed into a helical configuration like a telephone cord can stretch by extending its
geometry without elongating the conductor itself. This report establishes the proper configuration of copper
conductors arranged in a helical pattern around a fiber core which can be used as center of a nylon rope with
at least 20 percent working stretch. The calculation procedure allows the determination of the conductor's
helix angle or pitch as function of the required assembly elongation, the cable assembly's geometry, and the
fiber core's Poisson ratio. Limits of the geometry are established to assure defined flexibilty of the cable
assembly to allow bending of a surrounding fiber rope without conductor layer blockage. A sample stretch conductor
assembly was procured and initial testing is described, proving the calculation method's ability to
determine the correct geometry of the conductor assembly. Such conductor assemblies can be used as
conductive core of nylon ropes suitable for coastal and deepsea buoy moorings or as lift or trigger lines for
instrumentation. They are also considered the most suitable configuration which can endure the high stretch
requirements of embedded conductors in a stretch hose wall at its transition into a coupling section.
Suggested Citation
Paul, W. (1995). Design considerations for stretch conductors in oceanographic moorings. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/517Related items
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