4. The shaft that is pictured is to be loaded by a purely reversing load, cycling at ± 500 lbf. The shaft is to be machined, operate in an environment at 100°C, have a reliability of 90%, and be made of a material in which Sut = 80 kpsi and Sy = 65 kpsi. The stress concentrations at A are K: = 1.6 for bending and Kt = 2.0 for torsion. Assume the notch sensitivity factor for torsion and bending to be 1.0. 10 inches a. Using the information provided with the attached log-log scale, create an S-N diagram assuming a steel shaft subjected to only bending. Estimate how many cycles of life can be expected if the alternating stress is 60 kpsi. F = ± 500 lbf b. would the S-N diagram from part (a) be different if only torsion were experienced (no bending)? Briefly explain why. B 8 inches C. (.. Using a factor of safety of 2.0 based on infinite life, determine the minimum allowable diameter for shaft AB using the modified-Goodman criterion.

4. The shaft that is pictured is to be loaded by a purely reversing load, cycling at ± 500 lbf. The shaft is to be machined, operate in an environment at 100°C, have a reliability of 90%, and be made of a material in which Sut = 80 kpsi and Sy = 65 kpsi. The stress concentrations at A are K: = 1.6 for bending and Kt = 2.0 for torsion. Assume the notch sensitivity factor for torsion and bending to be 1.0. 10 inches a. Using the information provided with the attached log-log scale, create an S-N diagram assuming a steel shaft subjected to only bending. Estimate how many cycles of life can be expected if the alternating stress is 60 kpsi. F = ± 500 lbf b. would the S-N diagram from part (a) be different if only torsion were experienced (no bending)? Briefly explain why. B 8 inches C. (.. Using a factor of safety of 2.0 based on infinite life, determine the minimum allowable diameter for shaft AB using the modified-Goodman criterion.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Question

4. The shaft that is pictured is to be loaded by a
purely reversing load, cycling at ± 500 lbf. The
shaft is to be machined, operate in an environment
at 100°C, have a reliability of 90%, and be made of
a material in which Sut= 80 kpsi and Sy = 65 kpsi.
The stress concentrations at A are K₁ = 1.6 for
bending and Kt = 2.0 for torsion. Assume the notch
sensitivity factor for torsion and bending to be 1.0.
10 inches
a. Using the information provided with the
attached log-log scale, create an S-N diagram
assuming a steel shaft subjected to only bending.
Estimate how many cycles of life can be expected if the alternating stress is 60 kpsi.
F = ± 500 lbf
b. would the S-N diagram from part (a) be different if only torsion were experienced (no
bending)? Briefly explain why.
c. ( Using a factor of safety of 2.0 based on infinite life, determine the minimum allowable
diameter for shaft AB using the modified-Goodman criterion.
B
8 inches

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