Difference between Torque and Bending moment

Both torque and bending moment are types of moment and also have the same units (N-m); So where lies the difference?

 In simple words, bending moment causes bending of the section and torque (Torsional moment) causes twisting of the section. 

If we talk about stresses induced,

  • Due to torque - predominantly shear stress is induced in section

  • Due to bending - predominantly we have normal stresses

Given a section and a moment is applied, then how do we decide that this moment is torque or bending moment ?!

It depends on the axis about which moment is applied!

  • If moment is applied about the longitudinal axis - it causes twisting of the section - then we call it torque

  • If we apply moment along transverse axis - it causes bending of the section - then we can call it bending moment  

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