Civil Engineering Reference
In-Depth Information
120
kN
200 N/mm
2
100
80
500 N/mm
2
300 N/mm
2
60
40
cross lay 6
19
−
FC
−
sZ
20
D/d = 25
d = 16 mm
R
o
= 1280 N/mm
2
r = 0.53 d
0
10
3
−
0
10
20
30
40
50
60
number of bending cycles N
Fig. 3.63
Residual rope breaking force, Woernle (
1929
)
(a)
(b)
(c)
1,0
F
R
F
m
F
R
F
m
F
R
F
m
90
10
50
0,8
0,6
s
o
F
m
s
o
F
m
s
o
F
m
0,6
0,4
0,6
0,6
=
=
=
0,5
0,4
0,3
0,2
0,1
0
0,5
0,4
0,3
0,2
0,1
0
0,5
0,4
0,3
0,2
0,1
0
0,2
0
0,7
0,8
0,9
1,0
0,7
0,8
0,9
1,0
0,7
0,8
0,9
1,0
rel. nu. bending cycles A
rel. nu. bending cycles A
rel. nu. bending cycles A
Fig. 3.64
Relative residual rope breaking force, Feyrer and Gu (
1990
The bending fatigue tests where the wire rope runs over several sheaves have the
advantage that the wire rope being tested has zones with different numbers of
bending cycles. Jahne (
1992
) has carried out such bending fatigue tests with
parallel-lay ropes using the test sheave arrangement shown in Fig.
3.30
. From
these tests, the wire rope zones—loaded by different numbers of bending cycles—
has been used to find out the residual breaking force, Feyrer and Gu (
1990
). The
results which were evaluated by a first regression calculation are shown in
Fig.
3.64
.
From a newer regression calculation the relative number of bending cycles for
different limits c is
Search WWH ::
Custom Search