ut (i) A non-rotating beam of circular cross section is made of AISI 1040 steel (cold...

 

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ut (i) A non-rotating beam of circular cross section is made of AISI 1040 steel (cold drawn, S = 113 kpsi, S, = 86 kpsi), is subjected to a completely reversing bending moment M = M cos cot. For D = 1.5 inch, d = 1.25 inch, notch radius = (D-d)2, and Ma = 3000 lbf inch, estimate the fatigue factor of safety based on achieving infinite life. If infinite life is not predicted, estimate the number of cycles to failure. (ii) A midrange bending moment is added to the completely reversing bending moment. The resulting bending moment is M = M + M cos cot. For M = 2.5M, estimate the fatigue factor of safety based on achieving infinite life using the Goodman criterion. If infinite life is not predicted, compute the fatigue component strength by considering the midrange stress effect. (EIFR) ut (i) A non-rotating beam of circular cross section is made of AISI 1040 steel (cold drawn, S = 113 kpsi, S, = 86 kpsi), is subjected to a completely reversing bending moment M = M cos cot. For D = 1.5 inch, d = 1.25 inch, notch radius = (D-d)2, and Ma = 3000 lbf inch, estimate the fatigue factor of safety based on achieving infinite life. If infinite life is not predicted, estimate the number of cycles to failure. (ii) A midrange bending moment is added to the completely reversing bending moment. The resulting bending moment is M = M + M cos cot. For M = 2.5M, estimate the fatigue factor of safety based on achieving infinite life using the Goodman criterion. If infinite life is not predicted, compute the fatigue component strength by considering the midrange stress effect. (EIFR)