Shell elements from StructuralMechanicsApplication don’t work

[Vahid-Galavi]

I am using structural elements of StructuralMechanicsApplication in another application by calling them directly from python scripts. All structural elements, such as beam, truss and cable, work except the shell elements (both thin and thick ones). Is there anything that I have to consider for these types of elements?

Thanks for your help.

[philbucher]

Hi, can you post the error message? Afaik there is nothing special to consider

The tests are working, try to follow them when setting up your case

[loumalouomega]

Can you attach an example?

El mié., 29 ago. 2018 10:14, Vahid notifications@github.com escribió:

I am using structural elements of StructuralMechanicsApplication in another application by calling them directly from python scripts. All structural elements, such as beam, truss and cable, work except the shell elements (both thin and thick ones). Is there anything that I have to consider for these types of elements?

Thanks for your help.

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[Vahid-Galavi]

This is an example of the issue. Thanks in advance!

09_prescribedDisplacementOnThinShellGeoOnePhase.gid.zip

[loumalouomega]

Do I need to compile the Geomechanics? (I assume for the example yes). It is the current Geomechanics up to date what you have in your local branch?

[Vahid-Galavi]

No, it is not up to date. I will let you know, when I upload it.

[philbucher]

There is no GeoMechanicsApp in Master ...

I saw in your MDPA that you are defining Properties 1 for the shell elements and then also define some Material Props in the StructuralMechanics.json, be careful what to use (I recommend assigning empty Properties in the MDPA)

[Vahid-Galavi]

I managed to solve the problem for "thick shell" elements by setting "move_mesh_flag" to true in GeoMechanicsApplication.

"Thin shell" elements do not work in both GeoMechanicsApplication and StructuralMechanicsApplication. I have attached an example that I created in StructuralMechanicsApplication:

05_prescribedDisplacementOnThinShell.gid.zip

[loumalouomega]

@Vahid-Galavi there is no GeoMechanicsApplication in master

[Vahid-Galavi]

The last example that I attached, is created with StructuralMechanicsApplication. There I am using thin shell elements.

[loumalouomega]

Ok, I undertstood that the problem was the combination of both apps

[loumalouomega]

The problem works for me

[Vahid-Galavi]

Then I need to check why I don’t get good results. The results do not make sense to me.

Thanks for checking!

[loumalouomega]

The last steps are not converging, try to apply the load/displacement slower

[Vahid-Galavi]

It is a linear problem. Size of load/displacement should not matter. Anyway, I tried with smaller time steps. It didn't help. The results are still incorrect.

[loumalouomega]

OK, let me check in detail

[loumalouomega]

You need to set the displacement in function of time, here your example corrected. In any case certainly the shell converges poorer that I expected 05_prescribedDisplacementOnThinShell.gid.zip

[Vahid-Galavi]

Thanks @loumalouomega!

[philbucher]

closing since I think this is solved please reopen in case you have further questions @Vahid-Galavi