Tension Fatigue Model for Helically Armored Cables

[+] Author and Article Information
R. H. Knapp

Department of Mechancial Engineering, University of Hawaii at Manoa, Honolulu, Hawaii 96822

E. Y. C. Chiu

Macau Cement Manufacturing Co., Ltd., Ka-Ho, Coloane, Macau

J. Energy Resour. Technol 110(1), 12-18 (Mar 01, 1988) (7 pages) doi:10.1115/1.3231353 History: Received December 06, 1987; Online October 22, 2009


A fatigue model which predicts cycles-to-failure for helically armored cables subjected to fluctuating axial tension is proposed. Electrical-optical communication cables, power cables, and bridge and track strands normally derive structural strength from two or more layers of round steel wires contrahelically laid around a cylindrical core. In cases where wires are laid in direct contact with wires in adjacent layers, Hertz contact stresses produce wire failures leading to ultimate cable failure at tensions well below the static breaking strength. The proposed model treats cross-wire Hertz contact stresses as equivalent geometric notches in conjunction with the numerical solution of the governing helical wire cable equations. Model and physical test results show good agreement.

Copyright © 1988 by ASME
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