Difference between Torque and Bending moment
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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,
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Due to torque - predominantly shear stress is induced in section
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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!
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If moment is applied about the longitudinal axis - it causes twisting of the section - then we call it torque
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If we apply moment along transverse axis - it causes bending of the section - then we can call it bending moment
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