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Pressure output

Hi,

I am using Hypermesh for a short time.

I would like to know how to visualise pressure as an output in Hyperview. Using Hyperview, I can now see the displacement of my model and would like to see the pressure also.

In Optisctruct, I have created a controlcard and selected Outputs, then Pressure.

When I run Hypermesh, import the .h3d file and choose de contour, I can still select displacement but not pressure.

Could you help me please ? Do I have something else to create or select ?

Thank you

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Simon Križnik

Hi Laure,

assuming you are referring to contact pressure output: it is not supported in linear static analysis.

Please search the forum for queries first, if they are already treated as in this case:

https://community.altair.com/community?id=community_question&sys_id=bb76483a1b2bd0908017dc61ec4bcba9

Altair Forum User

Thank you for your answer.

In fact I only have 1 body, so I don't have any contact.

I have used PSCD loads to apply a displacement at some points of the component.

Is it possible to see in Hyperview the pressure corresponding to the applied displacement (instead of seeing the displacement corresponding to the applied pressures) ?

tinh

Could you try activating SPCF and OLOAD in control card GLOBAL OUTPUT REQUEST?

I think SPCD will be converted to OLOAD

Altair Forum User

You can also try ELFORCE, which is available for shell and other 1D elements.

The output on shell element is force/unit length

Altair Forum User

Thank you for your help.

I activated SPCF and OLOAD in control card Global Output Request.

I now have this types of result in Hyperview :

Capture.JPG.05f688b5b5a1b1067313f4afbe633ec8.JPG

Here are the SPCDs I applied on the model in Optistruct, the displacement and the SPCF Forces.

As the biggest SPCDs are in the right side, the biggest displacement is also on the right side. Is it normal that there is no SPDF Froces on the right ?

I am not sure that it shows what I want to see : the pressures that would deform the component (make the displacement that I constrained with the SPCD).<?xml version="1.0" encoding="UTF-8"?><?xml version="1.0" encoding="UTF-8"?><?xml version="1.0" encoding="UTF-8"?>

tinh

Could you show OLOAD (applied forces)?

Altair Forum User

Hi @tinh

Since the applied load is an enforced displacement, the applied load will show as zero with OLOAD.

@Laure

Can you try ELFORCE and check if that helps?

Altair Forum User

Right, the applied load are shown as zero with OLAOD (applied forces).

With ELFORCE, it doesn't change anything (don't have any more 'result types' in HyperView).

Altair Forum User

Hi

Right, the applied load are shown as zero with OLAOD (applied forces).

With ELFORCE, it doesn't change anything (don't have any more 'result types' in HyperView).

OK, that's because you have solid elements and ELFORCE are not available for solid elements. I will check if there is any workaround for the same.

tinh

Hi @tinh

Since the applied load is an enforced displacement, the applied load will show as zero with OLOAD.

@Laure

Can you try ELFORCE and check if that helps?

Yes, I understand.

in equations K.U=F , after set zero terms of F at SPC,SPCD dofs, optistruct will output F as OLOAD

so I think output SPCF data are OK

ELFORCE is internal force, I think it's not current @Laure 's concern

tinh

Thank you for your help.

I activated SPCF and OLOAD in control card Global Output Request.

I now have this types of result in Hyperview :

<?xml version="1.0" encoding="UTF-8"?>

Here are the SPCDs I applied on the model in Optistruct, the displacement and the SPCF Forces.

As the biggest SPCDs are in the right side, the biggest displacement is also on the right side. Is it normal that there is no SPDF Froces on the right ?

I am not sure that it shows what I want to see : the pressures that would deform the component (make the displacement that I constrained with the SPCD).<?xml version="1.0" encoding="UTF-8"?><?xml version="1.0" encoding="UTF-8"?><?xml version="1.0" encoding="UTF-8"?>

It looks abnormal, but I think you should activate GPFORCE in GLOBAL OUTPUT REQUEST

because above forces are only at SPCD nodes

after applying SPCD, matrix K will be Kmod and vector F will be Fmod

I think GPFORCE may represent Fmod

Altair Forum User

Yes, I understand.

in equations K.U=F , after set zero terms of F at SPC,SPCD dofs, optistruct will output F as OLOAD

so I think output SPCF data are OK

ELFORCE is internal force, I think it's not current @Laure 's concern

Agree, but it can be approximated.

GPFORCE in GLOBAL OUTPUT REQUEST

because above forces are only at SPCD nodes

after applying SPCD, matrix K will be Kmod and vector F will be Fmod

I think GPFORCE may represent Fmod