Find the shear center of the profile section with constant wall thickness symmetrical with respect to the x-axis in the figure

3.8-5 A stepped shaft ACB having solid circular cross sec- tions with two different diameters is held against rotation at the ends (see figure). (a) If the allowable shear stress in the shaft is 42 MPa, what is the maximum torque (Tmax that may be applied at section C? [Hint: Use Eqs. (3-49a and b) of Example 3-9 to obtain the reactive torques.] (b) Find (7)max if the maximum angle of twist is limited to 0.55°. Let G = 73 GPa. 38 mm 19 mm B 150 mm- PROB 3.8-5 To 380 mm I

Q3: A hexagonal cross section bar as shown in Figure (2) below, is used as a simply supported beam. The beam carries a central load of 60 kN. Draw the shear stress distribution diagram for a section of the beam at quarter of the beam length from the left hand support. Figure (2) 25 mm 30° 30°

A circular steel tube of length L = 1.1 m is loaded in torsion by torques T (see figure). T T r2 (a) If the inner radius of the tube is r, = 51 mm and the measured angle of twist between the ends is 0.5°, what is the shear strain y, (in radians) at the inner surface? (Enter the magnitude.) rad (b) If the maximum allowable shear strain is 0.00043 rad and the angle of twist is to be kept at 0.45° by adjusting the torque T, what is the maximum permissible outer radius (r,)may (in mm)? mm