Hi Samyak,

In Static Structural, you can perform a multi-step solution. Have the gear teeth oriented in CAD at the angle where the tooth first comes into contact. Let's say for example that the gear rotates by 10 degrees from first contact to last contact.

Create a model with a Revolute joint on each gear center. On one Revolute, apply the load of 35 Nm. On the other Revolute, apply a displacement of 0 degrees for Step 1. In each of the next 10 steps you will increase the angle on the displacement by 1 degree.

What that will do is load up the gear teeth in step 1 then each subsequent step you will have the teeth at another angle where you can plot the stress. In step 2 and beyond, if you have a frictional contact, the sliding friction force will be acting on the tooth surface as well as the normal contact pressure.

You need a fine mesh to show the Hertzian stress below the surface, so you definitely don't want to use Explicit Dynamics.

You can add a rotational velocity Inertial load to each gear to account for the stress generated by the rotational velocity.