Civil Engineering Reference
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Fig. 2.26 Torque of a spiral
round strand rope with two
strand layers, Feyrer (
1997
)
50
180
0
/100 d
135
0
/100 d
90
0
/100 d
45
0
/100 d
Nm
25
0
−
45
0
/100 d
−
90
0
/100 d
135
0
/100 d
−
0
180
0
/100 d
−
−
25
0
200
300
N/mm
2
400
100
Specific tensile force S/d
2
Fig. 2.27 Torque of a spiral
round strand rope with three
strand layers, Feyrer (
1997
)
200
Nm
180
0
/100 d
135
0
/100 d
150
100
90
0
/100 d
45
0
/100 d
50
0
0
45
0
/100 d
−
−
50
90
0
/100 d
−
135
0
/100 d
−
100
−
180
0
/100 d
−
−
150
N/mm
2
0
100
200
300
400
500
Specific tensile force S/d
2
In addition to the described investigation (1986) a lot of torque measurements
with spiral strand ropes have been done from the Institut für Fördertechnik der
Universität Stuttgart in a great part by students. This work was sponsored from
AVIF and the Drahtseilvereinigung, The results of this investigation are presented
by Feyrer (
1997
), in which the work of the students are listed.
The torque of a spiral strand rope with two strand layers is shown in Fig.
2.26
and that with three strand layers in Fig.
2.27
. The torque-tensile-force lines are all
buckled even for the not twisted rope. The reason for this buckling of the not
twisted rope is that the different strands are not loaded from the load beginning.
The relative big distance between the torque lines shows that the spiral strand
ropes are twist rigid.
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