Build upon the results of problem 3-97 to determine the minimum factor of safety for fatigue at point a, based on infinite life, using the modified goodman criterion. if the life is not infinite, estimate the number of cycles. the force f is applied as a repeated load. the material is aisi 1018 cd steel. from problem 3-97, the critical stress element experiences σx, bend = 48 kpsi, σx, axial = 0.5 kpsi, and τ = 20 kpsi.

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.