Hi Jean-Paul,
There seem to be some inconsistencies in the simulations results that I am
getting, therefore I wanted to check if I have applied the material laws
properly accounting for the heterogeneities. Below, I have addted the
edited functions that are responsible for that. Could you please let me
know if there is something wrong here? I have checked the material
properties (mu1, mu2 etc), and they are being read correctly by the code
from the parameters file. I have also checked that the material ids (1 and
2) are correctly applied to the cells where I need them.
--------------------------------------
void setup_lqp (const Parameters::AllParameters ¶meters, const unsigned
int &materialid)
{
//Material 1 - Thin Film
if (materialid == 1)
{
std::cout<<"1_id"<<std::endl<<parameters.mu1<<std::endl<<parameters.nu1<<std::endl;
material.reset(new
Material_Compressible_Neo_Hook_One_Field<dim,NumberType>(parameters.mu1,
parameters.nu1));
}
//Material 2 - Substrate
if (materialid ==2)
{
material.reset(new
Material_Compressible_Neo_Hook_One_Field<dim,NumberType>(parameters.mu2,
parameters.nu2));
}
}
-------------------------------------------
template <int dim,typename NumberType>
void Solid<dim,NumberType>::setup_qph()
{
std::cout << " Setting up quadrature point data..." << std::endl;
quadrature_point_history.initialize(triangulation.begin_active(),
triangulation.end(),
n_q_points);
for (typename Triangulation<dim>::active_cell_iterator cell =
triangulation.begin_active(); cell != triangulation.end();
++cell)
{
const std::vector<std::shared_ptr<PointHistory<dim,NumberType> > >
lqph =
quadrature_point_history.get_data(cell);
Assert(lqph.size() == n_q_points, ExcInternalError());
for (unsigned int q_point = 0; q_point < n_q_points; ++q_point)
lqph[q_point]->setup_lqp(parameters, cell->material_id());
}
}
--------------------------------------
Thanks!
Animesh
On Tuesday, November 3, 2020 at 12:09:03 PM UTC+5:30 Animesh Rastogi IIT
Gandhinagar wrote:
> Hi Jean,
>
> Sorry for late response. Thank you for your detailed answer. Using your
> suggestions I was able to assign the material ids to different area of my
> domain of interest.
>
> Thanks again!
>
> Animesh
>
> On Tuesday, October 27, 2020 at 3:05:39 AM UTC+5:30 Jean-Paul Pelteret
> wrote:
>
>> 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
>>
>> Thanks!
>>
>> Animesh
>>
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>>
>>
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