Dear Animesh,
Let me preface my suggestion by saying that you can introduce some
heterogeneity in more than one way. That is, you're not bound to using a
material ID (which is what I'm going to suggest), but you could use some
geometric arguments to determine which class or material properties
should dictate the constitutive response at a continuum point. You also
need not use the class-based structure that this code galley example
has. There are other tutorials (e.g. step-8) that use Functions that
return the material coefficients at any point in space. So you should
keep that in mind as you read my suggestion.
In my opinion, the simplest approach would be the following:
1. The PointHistory::setup_lqp() function
<https://github.com/dealii/code-gallery/blob/master/Quasi_static_Finite_strain_Compressible_Elasticity/cook_membrane.cc#L720-L724>
is the point at which the constitutive law at some quadrature point is
set. So you should extend this function in some way to make a decision
about which material it is in, and what the material law at that point
is. The first thing that you might do is add an argument for the
material ID, and then choose constiutitve parameters based on the
material ID. You'll note that the concrete constitutive law is stored in
a pointer. This makes it easy to extend to support other constitutive
laws, because you can for example abstract the
Material_Compressible_Neo_Hook_One_Field class into some base class and
other classes (maybe a Material_Compressible_Mooney_Rivlin_One_Field)
and then, based on the material ID, select which constitutive law is
applied at that quadrature point.
2. The PointHistory::setup_lqp() function is called from
Solid::setup_qph()
<https://github.com/dealii/code-gallery/blob/master/Quasi_static_Finite_strain_Compressible_Elasticity/cook_membrane.cc#L1203-L1211>
, and more specifically inside a loop over all cells. Its possible to
retrieve the cell->material_id() or cell->center() (or, if you create a
quadrature rule to help you then you can get the actual position of the
quadrature point if you want such granularity). You can then pass this
information in to PointHistory::setup_lqp() to help decide which
constitutive law / parameters to apply. If using the material ID then
you will, of course, want to set the material ID when building or
reading in your triangulation.
That is, at least, how I typically do things when using this code as a
basis for extension. I hope that this helps you introduce
heterogeneities into your problem!
Best,
Jean-Paul
On 26.10.20 08:15, Animesh Rastogi IIT Gandhinagar wrote:
Hello All,
I am trying to solve the wrinkling problem of a thin stiff film
attached to a soft substrate in dealii. I am using the code - from the
code gallery for this purpose. For the simulations, I would have to
consider the film and the substrate with different material properties.
I understand that I would have to do something within the class
Qudrature point history. However, I am getting a little confused on
how to approach it. It would be great if someone could help me with this.
This is the code that I am using for this purpose -
https://dealii.org/developer/doxygen/deal.II/code_gallery_Quasi_static_Finite_strain_Compressible_Elasticity.html
<https://dealii.org/developer/doxygen/deal.II/code_gallery_Quasi_static_Finite_strain_Compressible_Elasticity.html>
Thanks!
Animesh
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