Experimental values for the properties of an alloy steel have been found to be Su = 1480 MPa, Sy = 1370 MPa, E=207GPa, KIc = 81.4 MPa , e = 20 percent in 50 mm, k' = 1070 MPa, n' = 0.15, εf' = 0.48, σf' = 2000 MPa, b = -0.091, and c = -0.60. A direct tension member made of this alloy has a single semicircular edge notch that results in a fatigue stress concentration factor of 1.6. The net cross section of the member at the root of the notch is 9 mm thick by 36 mm wide. A completely reversed cyclic axial force of 72kN amplitude is applied to the tension member. How many cycles would you estimate that it would take to initiate a fatigue crack at the notch root?