Wire Ropes Under Bending and Tensile Stresses - Wire Ropes: Tension, Endurance, Reliability - page 244

500 X 10 3

WS 6 x 36 - NFC - sZ
R 0 = 1770 N/mm 2
tensile force S = 27.5 kN
rope diameter d = 20 mm
steel sheave D/d = 10.5 mm
bending length l = 75 d

400

mean

300

200

100

0

0 1 2

side deflection angle ˑ

3 4

Fig. 3.54 Discarding number of rope bending cycles under a different side deflection of the rope,
Neumann ( 1987 )

1.000.000

r

Lasche, l = 60d

WSC + 34x7, sZ
S

Käfig, l = 60d
Käfig, l = 250d / 450d

d =12 mm, R 0 =1770 N/mm 2

S

D/d = 25

r = 6,36 mm
ʳ = 60 8
ʳ

S = 16,8 kN, S/d 2 = 117 N/mm 2
S = 30 kN, S/d 2 = 208 N/mm 2
S = 45 kN, S/d 2 = 312 N/mm 2

D
steel

= 30 8

100.000

10.000

23 456

7

− 7 − 6 − 5 − 4 − 3 − 2 − 1 0 1

side deflection angle ˈ [ ]

Fig. 3.55 Breaking number of bending cycles for a multi-strand rope, D/d = 25, Schönherr

( 2005 )