4. A bar of steel has minimum properties of Se=40 kpsi, Sy = 60 kpsi, and Sut = 80 kpsi. The rotating bar is subjected to a steady torsional stress of 15 kpsi with a completely reversed bending stress of 25 kpsi. Find the factor of safety guarding against first-cycle yielding and either the factor of safety guarding against fatigue failure or the expected life of the part. For the fatigue analysis, use: 1) Goodman criterion 2) Gerber criterion

4. A bar of steel has minimum properties of Se=40 kpsi, Sy = 60 kpsi, and Sut = 80 kpsi. The rotating bar is subjected to a steady torsional stress of 15 kpsi with a completely reversed bending stress of 25 kpsi. Find the factor of safety guarding against first-cycle yielding and either the factor of safety guarding against fatigue failure or the expected life of the part. For the fatigue analysis, use: 1) Goodman criterion 2) Gerber criterion

Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

Publisher:Barry J. Goodno, James M. Gere

Chapter8: Applications Of Plane Stress (pressure Vessels, Beams, And Combined Loadings)

Section: Chapter Questions

Problem 8.2.7P: (a) Solve part (a) of the preceding problem if the pressure is 8.5 psi, the diameter is 10 in., the...

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