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?
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,
Yves
----- 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?