The tangential, radial, and axial forces applied to a gear are given in
Figure 1. The shaft of the gear is made of steel with Su = 900 MPa and
Sy = 700 MPa. The diameter of the shaft is d = 25 mm. The pitch diameter
of the gear is Db = 0.25 m and the length l is 0.05 m. The fillet of the shaft
has a fine ground surface. The geometric concentration factors for torsion,
axial, and bending loads are about ktt = 1.5, kta = 1.8, and ktb = 2.0.
Estimate the safety factor with respect to fatigue failure at the fillet for
90% reliability.
Matlab can be used
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