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[Getfem-users] Antwort: Re: 2D nonlinear plane stress

From: Moritz Jena
Subject: [Getfem-users] Antwort: Re: 2D nonlinear plane stress
Date: Wed, 16 Jan 2019 14:17:01 +0100

Hello Yves,

thank you for your answer.

I'm afraid I'm not into the topic weak form language and I'm not sure where to start with this problem.

I looked at the chapter in the documentation, however I don't know how to describe a plane stress material model with it.

I also studied the examples, that come with the MATLAB-Interface. There are a few examples, how to declare a material model with this weak form expressions. But I still don't know, how to build this expressions.

Can you give me a approach for this problem or where I can find expressions for such a problem?  Is there any literature that you can recommend?

Best regards,


Von:        Yves Renard <address@hidden>
An:        Moritz Jena <address@hidden>
Kopie:        getfem-users <address@hidden>
Datum:        09.01.2019 17:17
Betreff:        Re: [Getfem-users] 2D nonlinear plane stress

Dear Moritz Jena,

No, unfortunately, plane stress versions of Hyperelastic laws has not been implemented yet.

I would not be so difficult, but as to be made. If you need one in particular and have the _expression_, it is no so difficult to describe it with the weak form language.

Best regards,


----- Original Message -----
From: "Moritz Jena" <address@hidden>
To: "getfem-users" <address@hidden>
Sent: Tuesday, January 8, 2019 4:11:48 PM
Subject: [Getfem-users] 2D nonlinear plane stress

Dear GetFEM-Users,

I use the MATLAB-Interface of GetFEM to create a program that
automatically solves different models of the same problem.

The problem is three-dimensional, but can be reduced by plain stress
approximation. (to reduce computing time).

I want to define a nonlinear material with the brick

               gf_model_set(model M, 'add nonlinear elasticity brick',

For this nonlinear command it is specified in the description, that in 2D
always plain strain is used.

So my question is: Is there a way to define a nonlinear material with the
plain stress approximation? Or is it planned to install such an option in
a future release?

I hope you can help me with my problem.

Best regards,

Moritz Jena

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