Question: For the interval 103 N 106 cycles, develop an expression for the axial fatigue strength (Sf ) ax for the polished specimens of 4130 used

For the interval 103 ≤ N ≤ 106 cycles, develop an expression for the axial fatigue strength (S′f ) ax for the polished specimens of 4130 used to obtain Fig. 6–10. The ultimate strength is Sut = 125 kpsi and the endurance limit is (S′e) ax = 50 kpsi.

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