The provided S-N curve shows the fatigue strength of a ferrous component with unknown geometry. Given the following duty record, how much life is consumed? 500 cycles 2000 cycles 600 000 cycles 15000 cycles 40000 cycles How much life remains if this is a shaft turning at 60 ksi 49 ksi 10 ksi 35 ksi 28 ksi 900 RPM? How much life remains if the 60 ksi cycles could be eliminated from the history/duty record? Assume the same RPM.

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.