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Max Stress is ~38 MPa.

Doing some fatigue calculations, the endurance strength will be 94 MPa, therefore we expect no fatigue failure on this part.

Endurance Strength = (Surface Factor) * (Size Factor) * (Loading Factor) * (Tensile Strength) * (0.5)

4140 Tensile Strength is 655 MPa (https://www.azom.com/article.aspx?ArticleID=6769 )

Surface Finish: Machined => Surface Factor = 4.51 * (Tensile Strength) ^ (-0.265) = 0.8089

Size Factor assumed as minimum value since the loading isn’t standard and the size is nearly 10 inches in diameter.

Size Factor = 0.6

Loading Factor assumed again to be the minimum since there is some bending and torsional due to the loading.

Loading Factor = 0.59

Endurance Strength = 93.775 MPa

We can also add in a reliability factor. For 99.9999% reliability the Reliability Factor is 0.62, leading to an endurance strength of 58.14 MPa. Which we are also currently passing.

2023-12-27 Re-sim

Geometry changed to meet clearance for calipers. Still passing sims:

Max stress: 22.6 MPa

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