Chapter 5 Torsion [MOM]

The followings are assumptions about torsional deformation of a circular shaft, EXCEPT

• Deformation is linear

• Deformation is elastic

• Deformation becomes plastic

• Plane section remains planar and undistorted

• T is internal torque

• The shear stress has linear distribution

• m/sec

• rev/min or rpm

• rad/sec

• Hz

Define correctly the sign convention of both torque and angle of twist

• POSITIVE if the thumb of right hand directs INWARDS the shaft

• NEGATIVE if the thumb of right hand directs INWARDS the shaft

• Internal Torque

• Length of region

• Polar moment of inertia

• Modulus of rigidity or shear modulus

• Yield strength

Match correct internal moments with their corresponding stress

• Torsional moment, T with Normal stress;

  Bending moment, M with Shear stress

• Torsional moment, T with Shear stress;

  Bending moment, M with Normal stress