A lightweight rotating shaft for a pump on a plane is to be designed to support a cyclical load of 15,000 pounds during service. The maximum stress is the same in both tension and compression. The endurance limits or fatigue strengths for several candidate materials are shown below. Design the shaft, including an appropriate material, and justify your solution.
Material | Endurance Limit/Fatigue Strength (MPa) |
Al-Mn alloy | 110 |
Al-Mg-Zn alloy | 225 |
Cu-Be alloy | 295 |
Mg-Mn alloy | 80 |
Be alloy | 180 |
Tungsten alloy | 320 |
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