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paulsterx

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- TL;DR Summary
- Is the hoop stress tangential force acting on a spinning solid object a direct result of the radial (centrifugal) force occurring due to its rotation?

Hi, I have a question about hoop stress or tangential force acting within a spinning object such as a solid flywheel. As described in a textbook I’ve seen, the hoop stress tension force acting as if across the diameter of the object, trying to pull it apart, is a resultant of forces acting within that object. My question is, is that resultant tangential force the resultant of radial forces (centrifugal force) acting within the object due to rotation? Or something else? Again, my understanding is that if you were to calculate the vector sum of all centrifugal forces acting on the object (calculating centrifugal force as if it’s a real force) in one specific direction, the resultant of these radial forces would equal the tangential tension force (in a simplistic ideal situation with no other forces or masses taken into account). Is my understanding correct?

As a follow up, if the radial forces acting away from the centre of rotation were opposed by a much greater force acting towards the axis, would there still be a tangential tension force acting on the object, or would the net result now be a compression force acting to push the object together?

This is to settle a debate with a colleague!

Many thanks in advance!

Paul

As a follow up, if the radial forces acting away from the centre of rotation were opposed by a much greater force acting towards the axis, would there still be a tangential tension force acting on the object, or would the net result now be a compression force acting to push the object together?

This is to settle a debate with a colleague!

Many thanks in advance!

Paul