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31_ch 06 Mechanical Design budynas_SM_ch06

# 31_ch 06 Mechanical Design budynas_SM_ch06 -...

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Chapter 6 177 ¯ S a = ¯ S e = 29 . 6 kpsi z = − ln ( ¯ S a / ¯ σ a ) ( 1 + C 2 σ ) ( 1 + C 2 S ) ln ( 1 + C 2 σ )( 1 + C 2 S ) = − ln (29 . 6 / 12 . 48) (1 + 0 . 10 2 ) / (1 + 0 . 195 2 ) ln (1 + 0 . 10 2 )(1 + 0 . 195 2 ) = − 3 . 9 From Table A-20 p f = 4 . 481(10 5 ) R = 1 4 . 481(10 5 ) = 0 . 999 955 Ans . (b) All computer programs will differ in detail. 6-40 Each computer program will differ in detail. When the programs are working, the experi- ence should reinforce that the decision regarding ¯ n f is independent of mean values of strength, stress or associated geometry. The reliability goal can be realized by noting the impact of all those a priori decisions. 6-41 Such subprograms allow a simple call when the information is needed. The calling pro- gram is often named an executive routine (executives tend to delegate chores to others and
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