## QUALITATIVE Torque calculation

## QUALITATIVE Torque calculation

(OP)

Hi everyone. I've a question related to the QUALITATIVE computation of the required torque to make a rotation.

The image shows a cross section. Two rigid bodies (hollow cylinder and elliptic base cylinder) and a deformable element are shown.

Supposing to know all the mechanical properties required, how do I compute (qualitatively) the torque required to make a 90deg rotation of the inner elliptic body in order to deforme the deformable element?

The deformable body and the outer cylinder are linked along their contact surface, and cannot slide

The image shows a cross section. Two rigid bodies (hollow cylinder and elliptic base cylinder) and a deformable element are shown.

Supposing to know all the mechanical properties required, how do I compute (qualitatively) the torque required to make a 90deg rotation of the inner elliptic body in order to deforme the deformable element?

The deformable body and the outer cylinder are linked along their contact surface, and cannot slide

## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

another day in paradise, or is paradise one day closer ?

## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

In your case you are also going to have friction.

Cheers

Greg Locock

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## RE: QUALITATIVE Torque calculation

"What is difference between qualitative and quantitative?

What is the difference between quantitative and qualitative research? In a nutshell, quantitative research generates numerical data or information that can be converted into numbers. Qualitative Research on the other hand generates non-numerical data."

So, you want non-numerical data? How does that work?

## RE: QUALITATIVE Torque calculation

TTFN (ta ta for now)

I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg

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## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

https://www.alltrailer.ca/2018/01/31/torsion-axles...

Ted

## RE: QUALITATIVE Torque calculation

For "qualitative" I meant that I don't need a precise number but a good procedure to understand more or less the amount of required torque. The deformable part is an elastic element (rubber-like) and it deforms just elastically. I'd like to know (in the case I have to choose a servo motor) the required torque under the assumptions:

-elastic deformation of the deformable element;

-no deformation of the rigid bodies;

-no sliding of the deformable element.

-friction between the elliptic inner cylinder and the deformable element.

I hope I've been clearer

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## RE: QUALITATIVE Torque calculation

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another day in paradise, or is paradise one day closer ?

## RE: QUALITATIVE Torque calculation

But I would try with FEA anyway. Good nonlinear solver (like Abaqus) should provide results that will be close enough to reality.

## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

so I strongly for testing, Brian's either way (?), and FEA_way is "all the way with FEA" …

many ways to skin cats ...

another day in paradise, or is paradise one day closer ?

## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

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We've (generally) advised using reale world testing but you persist with trying to model this.

## RE: QUALITATIVE Torque calculation

## RE: QUALITATIVE Torque calculation

You want to have some idea of the loads so you can validate your FEA results. Having ball park numbers would certainly be helpful before physically building anything.