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
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
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?