Determine the approximate endurance strength in kpsi of a 0.7-in- diameter machine finished steel rod having an ultimate

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Determine The Approximate Endurance Strength In Kpsi Of A 0 7 In Diameter Machine Finished Steel Rod Having An Ultimate 1 (166.98 KiB) Viewed 18 times

Determine the approximate endurance strength in kpsi of a 0.7-in- diameter machine finished steel rod having an ultimate strength of 110 kpsi. Sut 200 kpsi (1400 MPa) (0.5S ut Se S' = 100 kpsi Sut > 200 kpsi 700 MPa Sut 1400 MPa ka = asut = 0.879d-0.107 0.3 < d < 2 in (d/0.3)-0.107 0.91d-0.157 2 < d < 10 in kb 7.62 ≤ d < 51 mm (d/7.62)-0.107 = 1.24d-0.107 1.51d-0.157 51 < d < 254 mm Table 6-2 Curve Fit Parameters for Surface Factor, Equation (6-18) Factor a Exponent Surface Finish Sat, kpsi Sat, MPa b Ground 1.21 1.38 -0.067 Machined or cold-drawn 2.00 3.04 -0.217 Hot-rolled -0.650 As-forged -0.758 11.0 12.7 38.6 54.9