31_ch 06 Mechanical Design budynas_SM_ch06

31_ch 06 Mechanical Design budynas_SM_ch06 -...

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Unformatted text preview: budynas_SM_ch06.qxd 11/29/2006 17:41 FIRST PAGES Page 177 177 Chapter 6 ¯ ¯ Sa = Se = 29.6 kpsi z=− =− ¯¯ ln ( Sa /σa ) 2 1 + Cσ 2 1 + CS 2 2 ln 1 + Cσ 1 + C S ln ( 29.6/12.48) ( 1 + 0.102 ) /(1 + 0.1952 ) ln (1 + 0.102 )(1 + 0.1952 ) = −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 program is often named an executive routine (executives tend to delegate chores to others and only want the answers). 6-42 This task is similar to Prob. 6-41. 6-43 Again, a similar task. 6-44 The results of Probs. 6-41 to 6-44 will be the basis of a class computer aid for fatigue problems. The codes should be made available to the class through the library of the computer network or main frame available to your students. 6-45 Peterson’s notch sensitivity q has very little statistical basis. This subroutine can be used to show the variation in q , which is not apparent to those who embrace a deterministic q . 6-46 An additional program which is useful. ...
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This note was uploaded on 12/13/2011 for the course EML 3013 taught by Professor Shingley during the Fall '11 term at UNF.

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