Question

The figure shows a section of an AISI 1040 forged and heat-treated steel shaft having machined surfaces with dimensions $D = 1.5$ in and $d = 1$ in. The heat-treat process resulted in minimum tensile strengths of $S_u = 100$ kpsi and $S_y = 70$ kpsi. The shaft section at the shoulder is subject to a completely reversed bending moment of 800 lb \cdot in and a steady torsion of 400 lb \cdot in. Determine the factor of safety for infinite life based on the modified Goodman relation coupled with the maximum-shear-stress theory.

          The figure shows a section of an AISI 1040 forged and heat-treated steel shaft having machined surfaces with dimensions $D = 1.5$ in and $d = 1$ in. The heat-treat process resulted in minimum tensile strengths of $S_u = 100$ kpsi and $S_y = 70$ kpsi. The shaft section at the shoulder is subject to a completely reversed bending moment of 800 lb \cdot in and a steady torsion of 400 lb \cdot in. Determine the factor of safety for infinite life based on the modified Goodman relation coupled with the maximum-shear-stress theory.

The figure shows a section of an AISI 1040 forged and heat-treated steel shaft having machined surfaces with dimensions D = 1.5 in and d = 1 in. The heat-treat process resulted in minimum tensile strengths of Su = 100 kpsi and Sy = 70 kpsi. The shaft section at the shoulder is subject to a completely reversed bending moment of 800 lb ·in and a steady torsion of 400 lb ·in. Determine the factor of safety for infinite life based on the modified Goodman relation coupled with the maximum-shear-stress theory.

Added by Robert R.

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