The most common engineering structures experiencing torsion are shafts connected to a power source (e.g. motor), either directly or indirectly. Here we look at how we translate the *power applied* from the motor into the corresponding *torque* and hence *shear stress* acting on the shaft.

- We are usually given the power rating (P) and operating speed (either ƒ in Hz or ω in rad/s).
- We will then use these inputs to calculate the torque, and then work out the shear stress.

Let’s look at an example now.

The most common engineering structures experiencing torsion are shafts connected to a power source (e.g. motor), either directly or indirectly. Here we look at how we translate the *power applied* from the motor into the corresponding *torque* and hence *shear stress* acting on the shaft.

- We are usually given the power rating (P) and operating speed (either ƒ in Hz or ω in rad/s).
- We will then use these inputs to calculate the torque, and then work out the shear stress.

Let’s look at an example now.