A transmission shaft supporting two pulleys A and B are mounted between two bearings C1and C2 as shown in figure 2. Power is transmitted from pulley A to B. The shaft is made of plain carbon steel having ultimate tensile strength = 600 N/mm2 and yield strength = 380 N/mm2. Determine the shaft diameter on the basis of torsional rigidity, if the permissible angle of twist between two pulleys is 0.50 and the shear modulus of the material is 80 kN/mm2. The permissible shear stress may be taken as 3.0% of the yield strength or 18% of the ultimate tensile strength, whichever is minimum. Check for its – safety
