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Guides
Shaft-loads
Factors
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8.6 Reliability
Use the reliability factor, K
r
, to de-rate the allowable fatigue strength and so reduce the probability of failure of the component.
K
r
= (1 - 0.08 D) where values of D are given below.
Values of Deviation Factor,D
Required Survival Rate (%)
Deviation Factor (D)
90
1.3
95
1.6
99
2.3
99.9
3.1
99.99
3.7