Dear Seyed Ali,
On 04/01/2017 01:19 PM, 'Seyed Ali Mohseni' via deal.II User Group wrote:
Dear Thomas,
Thank you. I checked the values and they are similar.
Good.
Within your predictor-corrector approach, I assume that you somehow
exchange data between each step in order to be able to interpolate the
old solution.
Yes. But here we use the functionality that is already very
well-developed in deal.II.
Am I able to use the same functions to store energy data in each Gauss
point within each element? Or am I forced to implement and use the
quadrature point history approach from step-18? Due to the storage of
all the values in each element, the computation becomes inefficient.
It would be nice to be able to access data anywhere and anytime.
Actually, if you are using Miehe's approach I am confident that you
will have to store the energy somewhere in order to find the maximum
value of the energy. Is that true?
In principle you are right. If you use Miehe's approach with the
strain-energy function to impose crack irreversibility, I would personally
use the idea from step-18. We however, inspired by Miehe's other paper
developed our own approach
to impose the crack irreversibility constraint, namely by penalization.
Either you really use penalization (simple,
augmented Lagrangian, etc. see my other papers with Wheeler/Mikelic and
Lee etc.) or
you impose penalization by active set as down with Timo. But in all
these approaches
we avoid indeed to store all energy values and create a history.
Best regards,
Thomas
Kind regards,
Seyed Ali
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