Polycrystal on deal ii

[A.Z Ihsan]

Hi, 

Would anyone give me a hint on how to implement the polycrystal problem, i.e. more than one grain boundary?

I already have the tensor mechanics solver written in deal.ii, but now it needs to be extended solveing also polycrystal problem. 

THank you. 

Best, 

ihsan

[Wolfgang Bangerth]

On 4/7/20 2:30 AM, A.Z Ihsan wrote:
>
> Would anyone give me a hint on how to implement the polycrystal problem, i.e.
> more than one grain boundary?
> I already have the tensor mechanics solver written in deal.ii, but now it
> needs to be extended solveing also polycrystal problem.

Ihsan,
that's a rather unspecific question. What have you tried already, and what
step specifically is it that you have trouble with?

Best
WB


--
------------------------------------------------------------------------
Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/

[A.Z Ihsan]

Hi Wolfgang, 

alright, suppose i have a box that divided into two regions, and each region has different elastic constant (anisotropy material). 

Perhaps the idea is when calculating the cell_matrix, inside the for-loop there is a function for choosing in which elastic constant to be used depending on the region. 

I already have the elastic solver written specifically for one elastic constant.  

Do you have any hint where should i start? 

BR, 

Ihsan

[Andrew McBride]

In the classical continuum approach to plasticity there is no grain boundary. The elastic anisotropy of the crystal is captured at the Gauss point level. So you would start by associating different materials properties (elastic / plastic) to Gauss points depending on their spatial location. 

Have a look at the CellDataStorage class and how it is used in step-44.

Best

Andrew

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[A.Z Ihsan]

Hi Andrew, 

Yes, thats what i want, just simply put the elastic anisotropy at the Gauss point level. 

Thank you for the answer. 

Best, 

Ihsan

Andrew

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[Wolfgang Bangerth]

On 4/7/20 11:59 AM, A.Z Ihsan wrote:
>
> Yes, thats what i want, just simply put the elastic anisotropy at the Gauss
> point level.

step-6 already does that: It uses different material parameters depending on
the location of the quadrature point.

Best
W.