Civil Engineering Reference
In-Depth Information
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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