When the deformation of a machine member is due to pure torsion only, the maximum torque is given by T = τZ in which
1
τ is the maximum shear stress and Z is polar modulus of section
2
τ is the maximum tensile stress and Z is modulus of section
3
τ is the maximum compressive stress and Z is modulus of section
4
τ is the maximum shear stress and Z is modulus of section