A 0.975-inch diameter ductile hot-rolled steel shaft is loaded in torsion and has an ultimate strength...

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A 0.975-inch diameter ductile hot-rolled steel shaft is loaded in torsion and has an ultimate strength in tension of 120 kpsi. The shaft is chrome-plated, resulting in a miscellaneous effects factor of 0.975. Assume values of unity for the reliability and temperature effects factors. Estimate the fatigue strength, in kpsi, at 1000 cycles. 0.9 0.88 0.86 0.84 Factor a 0.82 0.8 Surface Finish Ground Sut kpsi Sut MPa Exponent b 1.34 1.58 -0.085 Machined or cold-drawn 2.70 4.51 -0.265 0.78 Hot-rolled 14.4 57.7 -0.718 As-forged 39.9 272. -0.995 0.76 70 80 90 100 110 120 130 140 150 160 170 180 190 200 Skpsi [1 S = kkkkkkS kas k 0.879d07 k=0.85 0.59 bending axial torsion 0.5S S100 kpsi S200 kpsi (1400 MPa) Sd > 200 kpsi 700 MPa S>1400 MPa A 0.975-inch diameter ductile hot-rolled steel shaft is loaded in torsion and has an ultimate strength in tension of 120 kpsi. The shaft is chrome-plated, resulting in a miscellaneous effects factor of 0.975. Assume values of unity for the reliability and temperature effects factors. Estimate the fatigue strength, in kpsi, at 1000 cycles. 0.9 0.88 0.86 0.84 Factor a 0.82 0.8 Surface Finish Ground Sut kpsi Sut MPa Exponent b 1.34 1.58 -0.085 Machined or cold-drawn 2.70 4.51 -0.265 0.78 Hot-rolled 14.4 57.7 -0.718 As-forged 39.9 272. -0.995 0.76 70 80 90 100 110 120 130 140 150 160 170 180 190 200 Skpsi [1 S = kkkkkkS kas k 0.879d07 k=0.85 0.59 bending axial torsion 0.5S S100 kpsi S200 kpsi (1400 MPa) Sd > 200 kpsi 700 MPa S>1400 MPa