5.3.3.1 __Fatigue Failure
Example__

Suppose it has been observed that gun tube failures occur
according to the lognormal distribution with m
= 7 and s
= 2 (remember m
and s
are the mean and SD of the *ln *(t) data).
Find the reliability for a 1000 round mission and the hazard rate at 800
rounds. For this case, the variable t is the number of rounds.

where P ( z > -0.16 ) was interpolated from Table 5.3-1 and f ( z = -0.16 ) was
obtained from Table
5.3-2.