= The flat plate shown is a part in a machine. The plate has a width reduction as shown in the diagram. The dimensions are: W = 14 mm, W2 = 21 mm, t 5 mm, and notch radius p = 0.7 mm. = W2 W1 M When the machine is switched on, the machine applies a cyclic loading to the plate: a completely reversed bending moment amplitude Ma = 39 Nm. The material (aircraft quality AISI 4340 steel) has ultimate strength = 1172 MPa. Based on experimental data of smooth specimens subjected to completely reversed cyclic loading (m = 0), the S-N curve of this material is described by the Basquin equation: ar = f (2N) , where the fatigue strength coefficient of = 1758 MPa, and the fatigue strength exponent b = -0.0977. (a) Determine the fatigue notch factor kf of this plate. (b) Determine the fatigue life N of this plate.