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wire rope
termination
wire rope
termination
wire rope
L
Fig. 2.46
Test sample, wire rope with termination
Fig. 2.47 Number of load
cycles of a strand 1 9 7 for
different lengths using
Esslinger's results in
Fig.
2.45
2
d = 0,6 inch
˃
a
= 350N/mm
2
˃
max
= 0,7R
m
2
10
6
f = 3,5H
z
8
N
90
6
4
N
3
2
N
10
10
5
10
3
34 6
8
10
4
mm
2
2
Length L
2.6.4.3 Size Effect Wire Rope Length
Suh and Chang (
2000
) carried out tension-tension fatigue tests on a Warrington
rope with rope lengths of 10, 20 and 30 lay lengths. To their surprise, they found
that the number of load cycles increased slightly with the length of the rope. They
want to do further tests to help to understand this unexpected result. It is to be
supposed that the reason for the greater endurance of the longer rope pieces lies in
the fact that the loosening of the rope structure, especially in the neighbourhood of
the sockets, could be compensated better in longer pieces of rope.
Esslinger (
1992
) carried out tension-tension fatigue tests with a simple strand
1 9 7 with 0.6 in. and rope lengths L = 1,040, 2,030 and 19,430 mm. Figure
2.45
shows his results. Contrary to the findings of Suh and Chang, he discovered that, as
expected, the mean number of cycles decreases with the rope length. For the
simple strand Esslinger tested there can only be minimal possible loosening of the
rope structure.
Therefore, the loosening of the structure and the sockets can be considered as
not affecting the influence of the length on the strand endurance.
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