Question

Problem 4. A stepped ROTATING shaft is loaded as shown in the figure below. The forces at A and B are constant. The torque is on length BC and alternates from 0 to 1500 lbf*in and the shaft diameter of BC is 0.75 in. The shaft is simply supported at O and C. Assume that transverse shear stresses can be neglected. The fully corrected endurance limit is Se = 40 kpsi and Sut = 110 kpsi, Sy = 120 kpsi. The shoulder fillet at B gives a fatigue stress concentration for bending of K₁= 2.1 and for torsion of Kfs = 1.7 a) Check for yielding. b) Find the minimum fatigue factor of safety based on achieving infinite life using the GOODMAN fatigue failure criterion. c) If FINITE life is predicted, estimate the number of cycles to failure using the SMITH-WATSON-TOPPER (SWT) criterion. 6 in F = 600 lbf 6 in F=300 lbf

          Problem 4.
A stepped ROTATING shaft is loaded as shown in the figure below. The forces at A and B are constant. The torque is on length BC
and alternates from 0 to 1500 lbf*in and the shaft diameter of BC is 0.75 in. The shaft is simply supported at O and C. Assume that
transverse shear stresses can be neglected. The fully corrected endurance limit is Se = 40 kpsi and Sut = 110 kpsi, Sy = 120 kpsi. The
shoulder fillet at B gives a fatigue stress concentration for bending of K₁= 2.1 and for torsion of Kfs = 1.7
a) Check for yielding.
b) Find the minimum fatigue factor of safety based on achieving infinite life using the GOODMAN fatigue failure criterion.
c) If FINITE life is predicted, estimate the number of cycles to failure using the SMITH-WATSON-TOPPER (SWT) criterion.
6 in
F = 600 lbf
6 in
F=300 lbf

problem 4 a stepped rotating shaft is loaded as shown in the figure below the forces at a and b are constant the torque is on length bc and alternates from 0 to 1500 lbfin and the shaft diam 16555

Added by Emma D.

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