Search found 1125 matches

by Bernd
Wed Apr 01, 2020 5:12 pm
Forum: recrystallisation/grain growth
Topic: Place randomly distributed nuclei
Replies: 8
Views: 772

Re: Place randomly distributed nuclei

Hi Billy,

If you want to reduce the nucleation rate in order to match experimental results you should increase the nucleation distance instead, so that less nucleation sites are checked per nucleation time step.

Bernd
by Bernd
Wed Apr 01, 2020 11:08 am
Forum: recrystallisation/grain growth
Topic: Place randomly distributed nuclei
Replies: 8
Views: 772

Re: Place randomly distributed nuclei

Hi Billy, You should not restrict the number of nuclei, neither per seed type ("maximum number of new nuclei") nor per time step ("Max. number of simultaneous nucleations?"). This often leads to erratic grain distributions (if you do not use it for the exact purpose), because it just stops nucleatin...
by Bernd
Mon Mar 30, 2020 8:59 pm
Forum: solid-solid phase transformations
Topic: Ti6Al4V
Replies: 2
Views: 18

Re: Ti6Al4V

Hi Johann, It is true that Martensite transformations are very challenging for MICRESS (and phase-field methods in general) because these are no "normal" phase transformations with a moving interface. Physics are quite complex, and it is sometimes helpful to just have a tool which switches a grain f...
by Bernd
Wed Mar 25, 2020 9:41 pm
Forum: trouble-shooting
Topic: error (72) floating overflow
Replies: 8
Views: 38

Re: error (72) floating overflow

Dear Josh, I cannot reproduce your problem even trying with different sub-versions and with and without parallelization. Does your crash happen only with the parallel version? I would advice you, if possible, to switch to the newest version 7 of MICRESS. Otherwise, if serial works, you should do tha...
by Bernd
Mon Mar 23, 2020 10:57 pm
Forum: trouble-shooting
Topic: error (72) floating overflow
Replies: 8
Views: 38

Re: error (72) floating overflow

Dear Josh, This is a hard crash which does not give us a direct hint apart from that TQ-subroutines are involved (libtq). However, it seems that the crash appears either during or after updating of diffusion data. You can find this out by checking whether the .diff output has already been completely...
by Bernd
Mon Mar 23, 2020 10:29 pm
Forum: trouble-shooting
Topic: Issues running simulations in parallel version
Replies: 8
Views: 39

Re: Issues running simulations in parallel version

Dear Josh, Whether parallel computing will help or not can be judged from the .TabP output: - If most time is spent in the diffusion solver (or stress, temperature and fluid flow solver if activated), then parallelization can help tremendously. - If most time is spent in the interface treatment (PF-...
by Bernd
Tue Mar 17, 2020 7:16 pm
Forum: solid-solid phase transformations
Topic: Modification of chemical potential for elements at GB
Replies: 3
Views: 59

Re: Modification of chemical potential for elements at GB

Hi Chamara,

thanks a lot for the link - however there seems to be a login required...

Bernd
by Bernd
Mon Mar 16, 2020 10:06 pm
Forum: solid-solid phase transformations
Topic: Modification of chemical potential for elements at GB
Replies: 3
Views: 59

Re: Modification of chemical potential for elements at GB

Hi Chamara, No, this currently is not possible. In principle, it could be implemented in future as a contribution to the gradient of the diffusion solver. However, there are two problems: 1.) It would be necessary to have either a physical model, or the user would have to specify the energy differen...
by Bernd
Thu Mar 12, 2020 5:19 pm
Forum: MICRESS_training
Topic: MICRESS Advanced Training 2020 (cancelled)
Replies: 1
Views: 274

Re: MICRESS Advanced Training 2020 (cancelled)

Dear all,

Unfortunately, the MICRESS Advanced Training 2020 has been cancelled due to COVID 19 situation.
The same is the case for the two User Meetings. We are currently checking whether the events can be shifted to September.
Thanks for your understanding.

Best regards
Bernd
by Bernd
Mon Mar 09, 2020 4:35 pm
Forum: recrystallisation/grain growth
Topic: Mysterious Disappearance of Phase 1:
Replies: 1
Views: 65

Re: Mysterious Disappearance of Phase 1:

Hi yamaka, In your example you define a two phase microstructure, and you want to see grain growth. However, there also can be a phase transformation between phases 1 and 2. In your model, you have no coupling to concentration. That means, you have something like two phases of the same material, lik...