EXAMPLE 1 The suspender rod is supported at its end by a fixed-connected circular disk as shown in the figure below. If the rod passes through a 40-mm diameter hole, determine the minimum required diameter of the rod and the minimum thickness of the disk needed to support the 20-kN load. The allowable normal stress for the rod is allow= 60 MPa, and the allowable shear stress for the disk is Tallow= 35 MPa. 40 mm 20kN (a) Fig. 1-26 40 mm T 20 kN (b)