A Model for Friction Stresses in Cable Core

Abstract Accurate evaluation of friction stress is important for reliable fatigue life calculations of High Voltage Alternating Current cables used in off-shore wind installation. The cable cross section lay-up place the power-phase in the center of the cross section resulting in circumferential contact between the components. The stick-slip evolution for components in circumferential contact is different than for components in radial layer contact. A model for both onset and progression of slip for a three-core power phase design is explored. The slip progression involves equilibrium considerations of all three components. The slip zones of the individual components evolve in the longitudinal direction until they coalesce. The knowledge of global behaviour of slip onset and progression allows evaluation of bending and friction stresses on one individual component. This is similar to the bending and slip of a helix component resting on a cylinder layer. The assumptions used to verify the stick-slip progression are verified by numerical simulations.