Civil Engineering Reference
In-Depth Information
run on
run off
600
˕ L
˕ D
500
ˆ
400
rope 36 - 6 19s - SFC - sZ
˃ z = 600 N/mm 2
300
diameter ratio D/d = 28.8
2
bending stress
a
200
sec. ten. stress, strand
sec. tensile stress, wire
sum of the stresses
100
0
100
0
1
2
3
4
5
6
8
7
9
10
route of rope in strand lay lengthes
Fig. 3.8
Bending stress and secondary tensile stress in a wire, u S = 0 and uw = 0, Schiffner
( 1986 )
Fig. 3.9 Bending line of a
wire rope moving on and off a
sheave, Schiffner ( 1986 )
run off
run on
x z plane
x
z
plane
y z plane
y z plane
run off point
run on point
sheave
ˈ A
ˈ B
a A
a B
1mm
20mm
S
S
S
S
3.1.3 Stresses from the Rope Ovalisation
The groove radius of a rope sheave is normally greater than the half rope diameter.
When a wire rope loaded by a tensile force moves over the sheave, an ovalisation
of the rope arises, Bechtloff ( 1969 ). On the bottom of the groove, at least part of
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