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Determination of Shaft Diameters using Static & Fatigue Analyses**

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Static Analysis__

Use the following D.E.T. equation:

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Fatigue Analysis__

¨ First identify all the critical locations where fatigue analyses would be necessary

¨
Critical
locations are locations on the shaft where there is a ** combination**
of

¨
Stress
concentration locations are those locations where abrupt changes in the
cross-sectional area (case 1) occur ** or** where there is a
non-uniformity in the cross-section (case 2)

Use the following D.E.T. equation:

S_{e}=k_{a}k_{b}k_{c}k_{d}k_{e}S_{e}’

k_{e}=1/k_{f}

k_{f}=1+q(K_{t}-1)

Take K_{t}
for combined bending & torsion (use
K_{t}=2.5 for
keyseats)