Problem 2 The torsion rod with variable cross-section shown in Fig. 2.1 is clamped at A and carries point torques at B (4 kN.m), C (8 kN.m) and D (unknown value

7) with the senses indicated in the figure. It is known that the diameter of AB is 25 mm, the diameter of BC is 50 mm and the diameter of CD is 20 mm. Furthermore, 6LAB= 6LBC = 5LCD = 1200 mm. If the shear modulus of the material is 80 GPa, find: a) The value of T that would make the angle of twist at point C with respect to A equal to zero. LAB B 4 kN-m 1.BC C 8 kN-m LCD D b) The maximum value of T that can applied with the sense shown such that Fig. 2.1: Torsion rod with variable cross-section. failure does not occur for an allowable shear stress of 1.1 GPa. Can the condition from part a be achieved without failure?