TORSION 83-1 SUMMARY Shaft: In engineering the members of which deformations are mainly torsion. Such as transmission shafts in machines, drill rods in oil-drilling rigs etc Torsion: Resultant of the external forces is a force couple and its acting plane is perpendicular to the axis of the shaft. Under this case the deformation of the rod is torsion A B5 §3–1 SUMMARY Shaft:In engineering the members of which deformations are mainly torsion. Such as transmission shafts in machines, drill rods in oil-drilling rigs etc. Torsion:Resultant of the external forces is a force couple and its acting plane is perpendicular to the axis of the shaft. Under this case the deformation of the rod is torsion. A B O m m O B A