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312 Mechanical Engineering Design
Figure 6–30
Cam follower retaining spring. 1 in +
(a) Geometry; (b) designer’s 2 in 4
fatigue diagram for Ex. 6–11.
32 in
= 2 in
+
= 2 in preload
= 5 in
= 5 in preload
+
(a)
150
Amplitude stress component a , kpsi 100 Langer line
50
Gerber line
A A' A"
0
11 33 50 65.9 100 116 116.9127 150
Steady stress component , kpsi
m
(b)
The stress components are thus
K(2 + δ) − Kδ
σ a = = K = 10.99 kpsi
2
K(2 + δ) + Kδ
σ m = = K(1 + δ) = 10.99(1 + δ)
2
For δ = 0, σ a = σ m = 10.99 = 11 kpsi
