How to consider the rotational mass in linear elastic static analysis?

pucho
Posts: 15
Joined: Wed Oct 13, 2021 12:15 am

Re: How to consider the rotational mass in linear elastic static analysis?

Post by pucho » Mon Nov 22, 2021 12:07 pm

Thank you Francesca!
Attachments
parametric_push_mhb.zip
(1.55 KiB) Downloaded 20 times

marafini.f
Posts: 350
Joined: Fri Nov 13, 2020 1:52 pm

Re: How to consider the rotational mass in linear elastic static analysis?

Post by marafini.f » Thu Nov 25, 2021 9:47 am

Hi pucho, sorry for the late reply.
There is actually no model in your zip folder, just a .py file
Do you want to share your .scd file?

pucho
Posts: 15
Joined: Wed Oct 13, 2021 12:15 am

Re: How to consider the rotational mass in linear elastic static analysis?

Post by pucho » Thu Nov 25, 2021 2:15 pm

Sorry, Francesca, here is the file
Attachments
pushX_mhb.zip
(691.14 KiB) Downloaded 22 times

marafini.f
Posts: 350
Joined: Fri Nov 13, 2020 1:52 pm

Re: How to consider the rotational mass in linear elastic static analysis?

Post by marafini.f » Fri Nov 26, 2021 2:07 pm

I had no problem running your model pucho. What's wrong about it?

pucho
Posts: 15
Joined: Wed Oct 13, 2021 12:15 am

Re: How to consider the rotational mass in linear elastic static analysis?

Post by pucho » Fri Nov 26, 2021 9:16 pm

That is the model with simple interactions with no problem. The previous model I sent you, has the convergence problem.

marafini.f
Posts: 350
Joined: Fri Nov 13, 2020 1:52 pm

Re: How to consider the rotational mass in linear elastic static analysis?

Post by marafini.f » Mon Nov 29, 2021 8:43 am

Ah ok,
I thought you had done some modifications following these suggestions.
so if you erase your column and run the analysis no error occurs, so I think there is something wrong with how you defined them. I would suggest you draw your geometry separately and then move it in place after you created the interaction. Moreover, you need to check for instability, are you sure you gave enough DOFs property to avoid geometric singularities?
You can try assigning properties to the zeroLength first to all DOFs, than scaling down one by one and check when it starts to fail.

Let me know how your attempts goes.
Francesca

pucho
Posts: 15
Joined: Wed Oct 13, 2021 12:15 am

Re: How to consider the rotational mass in linear elastic static analysis?

Post by pucho » Wed Dec 01, 2021 12:22 pm

Thank you, Francesca, I will proceed as you suggest and let you know.

Best regards,

Hernan

marafini.f
Posts: 350
Joined: Fri Nov 13, 2020 1:52 pm

Re: How to consider the rotational mass in linear elastic static analysis?

Post by marafini.f » Mon Dec 06, 2021 8:38 am

You are welcome,
Enjoy your modelling
Francesca

pucho
Posts: 15
Joined: Wed Oct 13, 2021 12:15 am

Re: How to consider the rotational mass in linear elastic static analysis?

Post by pucho » Mon Dec 06, 2021 1:51 pm

Dear Francesca,

I have another question, I am using the OrthotropicMaterial mapper and I what to know if the requested properties are in Local or Global coordinates.

Thank you very much for your answer,

Hernan

marafini.f
Posts: 350
Joined: Fri Nov 13, 2020 1:52 pm

Re: How to consider the rotational mass in linear elastic static analysis?

Post by marafini.f » Tue Dec 07, 2021 9:22 am

Hi Hernan,

so the Orthotropic material behaves differently if you are applying it on a 3D element or on a 2D element.
Solids handle materials in the global coordinates, while shells in local coordinates. In the instance of shells, the X-axis corresponds to the first column of the Jacobian computer in the center.

Let me know if you need anything else.
Francesca

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