Torque is a rotational equivalent of a linear force that causes the twisting of a section about an axis. A bending moment as the name suggests is the moment that causes a section to bend. In this blog, we will see each of the terms in detail.

### Torque

Torque is a type of moment that causes the twisting of a section. It mostly acts perpendicular to a section. Torque is given as the product of force and perpendicular distance (radius) about which the force acts. Transmission shafts are often subjected to torque as they transmit power by rotation.

*Torque = Force (F) * Radius (r)*

### Bending Moment

The bending moment causes the bending of the section. It mostly acts along the plane of the section. The bending moment is given as the product of force and the perpendicular distance between the point (where the bending moment is required) and the point of action of force.

*Bending moment = Force (F) * Perpendicular distance between the point and the point of action of force*

### Difference Between Torque and Bending Moment

From the definition and formulas, it is understood that both torque and bending moments are some kinds of moments. They even have the same unit as Nm. What differentiates a bending moment from a torque is **the axis about which moment is applied.**

If the moment is applied about the

**longitudinal axis**-**Torque**If the moment is applied about the

**transverse axis**-**Bending moment**

Another distinguishing factor is the stresses caused by torque and bending moment.

Due to Torque, predominantly shear stress is induced

Due to the bending moment, predominantly normal stress is induced

Hope the key difference between torque and bending moment is understood. This is a short blog but if you want us to cover long boring topics in an interesting way let us know in the form below.

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