Study of VAPS mooring cable failure and alternative designs / by F.E. Roy. : En37-146/1981E-PDF

"During the 1980 summer operation of the Vertical Automatic Profiling System (VAPS), the centre strength member type mooring cable suffered failure of electrical conductors on two separate occasions. This incapacitated the system. Circumstances of these failures are described. A method for estimating stress in the conductor is developed and applied to the cable. It is concluded that the conductor failure was due to tensile fatigue stress in the conductors exceeding the endurance limit stress of copper. This stress was induced by the combination of conductor lay direction and centre core torque characteristic being such that tension on the cable core produced twist which tightened the conductor lay; thus magnifying the stress in the conductors. This stress would be considerably reduced if the lay was opposite.in direction, and increased from 5% to 17% take-up. Alternative cable configurations are considered, and it is recommended that the external braid configuration is the most likely candidate for success"--Abstract, page i.

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