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356 Mechanical Engineering Design
, k a , k c , k d , and K f can be internal, and answers to questions will allow C σ and C S , as well
0.30
as C n and ¯n d , to be calculated. Later you can add improvements. Test your program with prob-
lems you have already solved.
6–73 When using the Gerber fatigue failure criterion in a stochastic problem, Eqs. (6–80) and (6–81)
are useful. They are also computationally complicated. It is helpful to have a computer subrou-
tine or procedure that performs these calculations. When writing an executive program, and it
is appropriate to find S a and C Sa , a simple call to the subroutine does this with a minimum of
effort. Also, once the subroutine is tested, it is always ready to perform. Write and test such a
program.
6–74 Repeat Problem. 6–73 for the ASME-elliptic fatigue failure locus, implementing Eqs. (6–82)
and (6–83).
6–75 Repeat Prob. 6–73 for the Smith-Dolan fatigue failure locus, implementing Eqs. (6–86) and (6–87).
6–76 Write and test computer subroutines or procedures that will implement
(a) Table 6–2, returning a, b, C, and ¯ k a .
(b) Equation (6–20) using Table 6–4, returning k b .
(c) Table 6–11, returning α, β, C, and ¯ k c .
(d) Equations (6–27) and (6–75), returning ¯ k d and C kd .
6–77 Write and test a computer subroutine or procedure that implements Eqs. (6–76) and (6–77),
returning ¯q, ˆσ q , and C q .
6–78 Write and test a computer subroutine or procedure that implements Eq. (6–78) and Table 6–15,
√
returning a, C Kf , and ¯ K f .