Civil Engineering Reference
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800
N/mm
2
600
Buchholz (1965)
500
400
rotary bending tests
wires out of ropes
300
200
new wires
Wolf (1987)
100
0
N/mm
2
0
500
1000
1500
2500
strength R
m
Fig. 1.16 Alternate strength r
Alt
for wires with a great range of measured tensile strength R
m
,
Wolf (
1987
)
Fig. 1.17 Relative rotary
bending strength r
Rot
/R
m
for
rope wires, Wolf (
1987
)
0.45
wires out of ropes
wire diameters
ʴ
= 0.80 - 1.08 mm
0.40
0.35
0.30
1200
N/mm
2
1400 1600
strength R
m
1800
2000
2400
r
Rot
¼
0
:
334
þ
0
:
173
R
m
:
ð
1
:
3c
Þ
That means that with increasing tensile strength R
m
, the relative rotary bending
strength r
Rot
/R
m
will be reduced as seen in Fig.
1.17
, Wolf (
1987
).
Ziegler et al. (
2005
) and Wehking (
2005
) evaluated the rotary bending strength
from tests with the Stuttgart rotary bending machine to be
lg r
Rot
¼
1
:
411
þ
0
:
396
lg R
m
0
:
128
lg d
:
ð
1
:
3d
Þ
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