Hi, everyone!
Now I am starting the research on cardiac mechanical modelling. The user defined function "UMAT" was used to implement the anisotropic hyperelastic Fung-type model . Now I come across some difficulties to write UMAT subroutine. Can someone recommend me some useful codes that can let me know how to write it.
Thank you very much for your kind assistance. You can also e-mail directly: zhanxin06112 [at] yahoo.com.cn (zhanxin06112[at]yahoo[dot]com[dot]cn)
The following material
The following material might be helpful
http://imechanica.org/files/Writing%20a%20UMAT.pdf
In reply to The following material by Lihua Jin
thanks for your sharing
Thanks, Lihua
yes, I have read this tutorial before, but How did
deduce the Cauchy stress and the material Jacobian
matrix. In this tutorial, I don't understand these
mathematical deduction well. So, it's not easy for me to
understand the UMAT subroutine. Especially the
tensor expression is very complex, how does
implement them into UMAT subroutine.
In reply to thanks for your sharing by Jason Liu
You are right that UMAT
You are right that UMAT requires you to take tensor derivatives. However, if you take a derivative with respective to the components of a tensor, things wil become much easier. You can try to do that following the examples in the UMAT tutorial.