Abstract
A model is developed to predict bending stiffness for helical strands such as wire ropes and overhead electrical conductors subjected simultaneously to tension and quasi-static bending when friction is present. The analysis combines and extends earlier works to investigate internal slippage and its effect on the bending stiffness of strands. It consists on a quantitative treatment of the transition from no-slip to full slip where a criterion is established to estimate relative displacements and to locate the sliding zones. Yet, this model allows prediction of the contact forces distribution, energy dissipation and bending stiffness when the cable is subjected to constant curvature. An experimental set up is used to compare calculated and measured bending stiffness. Theoretical and experimental bending stiffness lie well within theoretical bounds. Encouraging agreement between theory and experiment is found.
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