# a04.pdf - 1 ME 3E05(2017-2018 Assignment 4[1(2 marks A...

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1 ME 3E05 (2017-2018) Assignment # 4 [1]. (2 marks) A non-rotating circular shaft supported on two bearings at the two ends is subjected to fully reversed cyclic transverse force P = 700 lbf, as shown in the figure below. The material of the shaft is AISI CD 1020 steel ( 57 , 68 y ut S Kpsi S Kpsi ) with a machined finish. The left and right shoulders have radii of 1/4 th and 1/8 th inch respectively. Determine the fatigue life of the shaft? Assume 99.99% reliability. [2]. (3 marks) A solid circular shaft with a machined fillet of radius 1/8 inch is subjected to a cyclic torque amplitude of 900 lbf-inch and a steady mid-range torque of 2500 lbf-inch. The shaft is required to have a transition diameter ratio (D/d 0 ) of 1.5. The material properties of the shaft are 57 y S Kpsi and 68 . ut S Kpsi Determine the shaft dimensions D and d 0 for a life of 500,000 cycles, assuming a factor of safety of 1.5. Utilize Goodman fatigue failure locus line in the analysis. Assume a reliability of 99%.

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