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Boundary Prescribed Displacement

Posted Mar 9, 2025, 7:11 p.m. EDT Geometry, Structural Mechanics 3 Replies

Quan Yuan
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Hi community,

I am using prescribed displacement to discover the bistable buckling now. I find that even I only want to apply the displacement in y-direction and set 0 to other directions, check or un-check the box has huge influence on my force vs displacement graph.

The attached screenshots are different settings and results

3 Replies Last Post Mar 10, 2025, 5:24 p.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 8 months ago Mar 10, 2025, 10:04 a.m. EDT

I am not sure I understand your question. Changing the boundary conditions is expected to change the solution. Do you have a specific reason to expect the solution not to change in this case?

Jeff

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Jeff Hiller
I am not sure I understand your question. Changing the boundary conditions is expected to change the solution. Do you have a specific reason to expect the solution not to change in this case? Jeff
Quan Yuan
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Posted: 8 months ago Mar 10, 2025, 5:01 p.m. EDT

Hi Jeff,

Sorry for not clarify it clearly, I am trying to do a post buckling study like the below: https://www.comsol.com/model/postbuckling-analysis-of-a-hinged-cylindrical-shell-10257

So I am applying the prescribed displacement to my structure, and I want that displacement only in one direction (y). I don't understand why even I set the condition in other two directions as "0", check or un-check them still make such big difference on my result.

Hi Jeff, Sorry for not clarify it clearly, I am trying to do a post buckling study like the below: https://www.comsol.com/model/postbuckling-analysis-of-a-hinged-cylindrical-shell-10257 So I am applying the prescribed displacement to my structure, and I want that displacement only in one direction (y). I don't understand why even I set the condition in other two directions as "0", check or un-check them still make such big difference on my result.
Jeff Hiller COMSOL Employee

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Posted: 8 months ago Mar 10, 2025, 5:24 p.m. EDT

Hello Quan,

If you do not check the checkbox, then the constraint is not applied.

Best,

Jeff

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Jeff Hiller
Hello Quan, If you do not check the checkbox, then the constraint is not applied. Best, Jeff

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