– 5 For axially loaded, unnotc

– 5 For axially loaded, unnotched specimens of 2024-T3 aluminum, Table P9.8 gives fatigue test data for zero mean stress. Table P9.35 gives additional data for nonzero mean stresses, specifically, for various combinations of σmax and R = σmin/σmax, with N f being given in thousands of cycles. Combine the data from Tables P9.8 and P9.35 into a single data set and proceed as follows: (a) For the Goodman relationship, Eq. 9.15, calculate σar for each test, and plot these versus N f . Add the line from the fit to the zero mean stress data of Prob. 9.8, and comment on the success of the correlation. (b, c, d) Proceed as in

(a) for the mean stress relationships of

(b) Morrow with σ˜ f B,

(c) Morrow with σ’f , and (d) SWT.

- 5 For axially loaded, unnotched specimens of 2024-T3 aluminum, Table P9.8 gives fatigue test data...

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