Steel cables play an important role in many offshore applications. In many cases, an understanding of the magnitude and pattern of bending stresses in the individual component wires of a bent strand is essential for minimizing the risk of their failure under operating conditions. Following previously reported experimental observations, a theoretical model is proposed for obtaining the magnitude of wire bending stresses in a multi-layered and axially preloaded spiral strand fixed at one end and subsequently bent to a constant radius of curvature. The individual wire bending stresses are shown to be composed of two components. The first component is the axial stress generated in the wires due to interwire/interlayer shear interactions between the wires in a bent cable, and the second component is associated with the wires bending about their own axes. Using the theoretical model, which includes the effects of interwire friction, parametric studies on a number of realistic helical strands with widely different cable (and wire) diameters and lay angles subjected to a range of practical mean axial loads, and subsequently bent to a range of radii of curvature with one end of the cable fixed against rotation, have been carried out. It is shown that for most practical applications, the axial component of wire stresses due to friction is much greater than the second component of bending stresses associated with the individual wires bending about their own axes.
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August 1992
Research Papers
Wire Stress Calculations in Helical Strands Undergoing Bending
M. Raoof,
M. Raoof
Civil and Structural Engineering Department, South Bank Polytechnic, London, U.K.
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Y. P. Huang
Y. P. Huang
Civil and Structural Engineering Department, South Bank Polytechnic, London, U.K.
Search for other works by this author on:
M. Raoof
Civil and Structural Engineering Department, South Bank Polytechnic, London, U.K.
Y. P. Huang
Civil and Structural Engineering Department, South Bank Polytechnic, London, U.K.
J. Offshore Mech. Arct. Eng. Aug 1992, 114(3): 212-219 (8 pages)
Published Online: August 1, 1992
Article history
Received:
March 12, 1991
Revised:
January 21, 1992
Online:
June 12, 2008
Citation
Raoof, M., and Huang, Y. P. (August 1, 1992). "Wire Stress Calculations in Helical Strands Undergoing Bending." ASME. J. Offshore Mech. Arct. Eng. August 1992; 114(3): 212–219. https://doi.org/10.1115/1.2919973
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