Wire Ropes Under Bending and Tensile Stresses - Wire Ropes: Tension, Endurance, Reliability - page 288

Table 3.15 Endurance factors

Rope lubrication
Rope well lubricated f N1 = 1.0

Rope without lubrication, Müller ( 1966 ) f N1 = 0.2

Side deflection, Schönherr ( 2005 ), Neumann ( 1987 )

f N2 ¼ 1 0 : 00863 þ 0 : 00243 D
d

# 0 : 00103 # 2
angle of side deflection # in

Sheave groove (authors see Sect. 3.2.3 )
- Steel round groove Groove radius r/d = 0.53

r/d = 0.55
r/d = 0.60
r/d = 0.70
r/d = 0.80
r/d = 1.00

f N3 = 1.00
f N3 = 0.79
f N3 = 0.66
f N3 = 0.54
f N3 = 0.51
f N3 = 0.48

2

- Plastic round groove

f N3 0 : 75 þ 0 : 36 S/d 2

S/d 2
D/d D/d 0 : 023

Sheave, form grooves
- Undercutted groove Undercut angle

Holeschak ( 1987 )

a = 75
a = 80
a = 85
a = 90
a = 95
a = 100
a = 105

f N3 = 0.40
f N3 = 0.33
f N3 = 0.26
f N3 = 0.20
f N3 = 0.15
f N3 = 0.10
f N3 = 0.066

- V groove Angle

Holeschak ( 1987 )

c = 35
c = 36
c = 38
c = 40
c = 42
c = 45

f N3 = 0.054
f N3 = 0.066
f N3 = 0.095
f N3 = 0.14
f N3 = 0.18
f N3 = 0.25

Multi-layer rope spooling, Briem ( 2002 ), Weiskopf (2005, 2007 )

f N3 ¼ 0 : 005 þ 0 : 00085 S
d 2

Twisted ropes, Weber ( 2013 ), Endurance factors f N4
Endurance factor

lg f N4 ¼ a 1 x þ a 2 x 2

x in /100d

Ropes a 1 a 2 Validity area

Parallel lay FC-sZ 9 : 2 10 6 5 : 6 10 8 ±1080/100d

Parallel lay IWRC-sZ

1 : 4 10 5 2 : 5 10 7

±1080/100d

Spiral round strand 3 : 8 10 4

1 : 7 10 5

±180/100d