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Shaft A in the figure below is made of 1030 HR steel (see Appendix A-20 for properties) and is subject to a time-varying force, F that ranges from –200 lbf to 400 lbf. The theoretical stress concentration factor at the 5 in fillet is Kts = 1.4. Using the modified Goodman line, what is the factor of safety with respect to fatigue? Hint: Use shear version of modified Goodman diagram (in other words, replace all o's with the analogous T's) for this problem. See section 6 - 13 for guidance. Note that you will have to find the actual shear endurance limit according to the formula: Sse = kakykes Also, do not forget that the the nominal stress will be increased due to an appro- priate stress concentration factor found from the given Kts and Figure 6-21. -in dia 1 in 1 in 1 in fillet Shaft A Shaft B