A solid round bar with diameter of 2-in has a groove cut to a diameter of 1.8-in, with a groove radius of 0.1-in. the bar is not rotating. the bar is loaded with a repeated bending load that causes the bending moment at the groove to fluctuate between 0 and 25000 lbf-in. the bar is hot-rolled aisi 1095, but the groove has been machined. determine the factor of safety for fatigue based on infinite life (use the asme elliptical criteria) and the factor of safety for yielding.

Question

Maritza Fernandez

Physics

8 November, 19:50

A solid round bar with diameter of 2-in has a groove cut to a diameter of 1.8-in, with a groove radius of 0.1-in. the bar is not rotating. the bar is loaded with a repeated bending load that causes the bending moment at the groove to fluctuate between 0 and 25000 lbf-in. the bar is hot-rolled aisi 1095, but the groove has been machined. determine the factor of safety for fatigue based on infinite life (use the asme elliptical criteria) and the factor of safety for yielding.

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Raquel Watkins · Answer 1

I believe the factory of fatigue based on infinite life will not reach infinite life. Maybe if the round bar has a 3-in diameter with a groove cut of 2.1-in in diameter it can reach infinite life. It should be expanded to a grove radius of 1.3-in with a rotating bar. It should also be hot-rolled aisi 1080 and not machined. The factory should end at a satisfactory safety yielding.