The Bending of Spiral Strand and
Armored Cables Close to
Terminations
Journal of Energy Resources Technology, (1984)Abstract
The problem of the bending of a spiral strand or armored cable is addressed, with
particular reference to the "free bending" situation where pulleys or other
restraints are absent.· The analysis, based on a study of the properties of the layers
of wires which form the strand (or armor). treats the "free field" bending, remote
from the termination. A· parallel treatment of the situation close to a termination is
summarized. In the former case, limiting values for the effective bending stiffness
of the strand are presented; in the latter case an examination of the behavior of an
outer layer of wires sliding (with known frictional characteristics) over an inner
core has led to predictions of the strains and movements between the individual
wires and the inner core (as a function of wire position in the strand) which are
reported in the paper. The results off er an explanation of some experimental observations
from fatigue tests on a large (J9mm) strand under combined steady
axial load and lateral movements causing bending adjacent to the restrained termination.
In particular the observed wire failures close to the socket, not at the
extreme fiber positions but at the neutral axis, can be explained in terms of the
much larger slip on the interlayer contact points there.
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