Is it possible to make a measure on Static Structural?

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  • Last Post 25 May 2020
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Catacaldos posted this 20 May 2020

Hi everyone!

I am doing a compression test to an oval shape (it would be a quarter of a hollow sphere, more or less, although it's irregular since the thickness of the ovoid varies from one point to another) Once the compression is finished, I need to know the gap which is below the ovoid at some points from the base.

I put a rubber witness, which does not offer resistance, and activated its total deformation (since it would mark exactly the distance between the base and the points I want to measure) but it gives a lot of problems for solving the exercise. In fact, the compression itself, without the witness, already gives some problems if I put a high displacement.

My question is to know if a direct measurement can be made with any command from the point I want to measure of the ovoid, to the plane that makes the base.

 

Regards, and thank you very much!

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Aniket posted this 20 May 2020

Sorry, can you post some inline images describing the problem? The description is not very clear to me.

Also, what is a rubber witness?

If you want a simple GUI way, to get a nodes distance from a fixed point from point [1,2,3] you can use a simple user-defined result with an expression as follows:

sqrt[[loc_defx*loc_defx-1*1]+[loc_defy*loc_defy-2*2]+[loc_defz*loc_defz-3*3]]

 

 

-Aniket

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Catacaldos posted this 20 May 2020

Hi Aniket

Thank you for your response.

I'm attaching one image.

 

The rubber witness is just my poor traduction. It's an indicator. I make the compression and the ovoid deformates the indicator. And I could see exactly its deformation and therefore the free gap under the ovoid. 

My point is to measure that gap, because it's not a perfect ovoid (the thickness changes) and I need to know it in some differente places. 

Thanks!

 PS: In any case, the measurement would be without the indicator since it gives too many convergence problems to solve the compression of the ovoid.

Aniket posted this 20 May 2020

So you must have define a contact between the rubber dome and the cylindrical part right? If yes, you can insert a contact tool in the solution branch of the tree and check the gap.

Catacaldos posted this 21 May 2020

Hi again Aniket

 

Thanks for your answer. I didn't know the gap tool. But it is not what I am looking for. In the following image, I show you the distance that I want to measure.

You can think that the simplest thing is to subtract the deformation that appears in the image minus the initial distance of the ovoid without deforming, but you have to take into account that the thickness is variable, that's why I want to know how to calculate that internal distance, regardless of the distance initial and thickness.

Thank you again, Aniket.

Aniket posted this 22 May 2020

So shouldn't this work?

sqrt[[loc_defx*loc_defx-1*1]+[loc_defy*loc_defy-2*2]+[loc_defz*loc_defz-3*3]]

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Catacaldos posted this 22 May 2020

Hi again Aniket

Thanks for your response. I'm having this problem now: "Syntax error for the expression of user defined result: sqrt[[loc_defx*loc_defx-1*1]+[loc_defy*loc_defy-2*2]+[loc_defz*loc_defz-3*3]]

 I'm attaching the problem, so you can check it. Thanks again.

Aniket posted this 22 May 2020

Ansys employees can not download any attachments from the community.

Anyways, You need to replace the square brackets by round ones as shown in the image.

I replaced them by square brackets because the system does not allow a string with round brackets.

-Aniket

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Catacaldos posted this 25 May 2020

Hi Aniket

It's working now. I didn't see your attached image. Thanks for your time.

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