How to view principal strains/stresess

todd_alan_martin · 2010-12-13 02:15:17

Hi

I can extract the principal strain/stresses from a solution using

strain=POST_RELEVE_T(ACTION=(_F(OPERATION='EXTRACTION',
INTITULE='Principal Strain',
RESULTAT=res,
NOM_CHAM='EPSI_ELNO_DEPL',
GROUP_NO='Shell',
ELEM_PRINCIPAUX='OUI',),),);

and print them in tabular form via

IMPR_TABLE(TABLE=strain,
UNITE=38,);

But how do I get these data into gmsh or med format for viewing as a surface contour plot?

Todd.

dbpatankar · 2010-12-13 11:21:26

Use IMPR_RESU with something like :

IMPR_RESU(FORMAT='MED',
UNITE=80,
RESU=_F(MAILLAGE=MAIL,
RESULTAT=RESU,
NOM_CHAM=('EPSI_ELNO_DEPL',),
),
);

And add rmed entry to the export file.

Archibald Archambaud · 2010-12-13 13:18:36

Hi Todd.

You can compute the EQUI_ELNO_EPSI, where you find the component PRIN_1, PRIN_2, PRIN_3 (principal strain). The equivalent for the stress is of course EQUI_ELNO_SIGM.

AA

todd_alan_martin · 2010-12-14 00:51:53

Thanks Archibald.

I will try that.
Where are these options PRIN_1, PRIN_2, PRIN_3 documented?

todd_alan_martin · 2010-12-14 01:13:53

Hi Archibald

That doesn't work. I get the following error.

! option EQUI_ELNO_EPSI non disponible sur les elements du modele !
! pas de champ crea

I am using 2D elements here, not 3D. Now what???

Last edited by todd_alan_martin (2010-12-14 02:16:53)

delmas · 2010-12-14 10:13:01

Post your .comm file.

rcbsimoes · 2010-12-14 11:49:40

take a look here:

http://www.caelinux.org/wiki/index.php/ … ster/comms

rui

todd_alan_martin · 2010-12-14 13:12:30

Hi Delmas

My comm and med files are attached. Please have a look and advise me.

Thanks,
Todd.

Attachments:
test.tar.gz, Size: 18.32 KiB, Downloads: 444

Thomas DE SOZA · 2011-05-27 08:33:23

Hi,

Sadly EQUI_ELNO_EPSI (from now on known as EPEQ_ELNO) is not programmed for plates/shells (DKT/DST/COQUE_3D). So this explains the error.
The workaround you suggested in the other post (doing it in GMSH) is one solution. Another would be to use FORMULE + CREA_CHAMP (a great training for CREA_CHAMP use) in Code_Aster to compute by hand the scalar Von Mises strain field.

TdS

todd_alan_martin · 2011-05-30 06:37:21

Thank Thomas.

That looks like a useful feature.

Todd.

toltec · 2012-06-29 23:47:20

Hello,

Thomas DE SOZA wrote:

Hi,
Sadly EQUI_ELNO_EPSI (from now on known as EPEQ_ELNO) is not programmed for plates/shells (DKT/DST/COQUE_3D). So this explains the error.
The workaround you suggested in the other post (doing it in GMSH) is one solution. Another would be to use FORMULE + CREA_CHAMP (a great training for CREA_CHAMP use) in Code_Aster to compute by hand the scalar Von Mises strain field.
TdS

Is it still not possible to calculate COQUE_3D principal strains directly in V10.6? If not does anyone perhaps have an example using Thomas's suggestion above? It would be a great help!

I'm doing a STAT_NON_LINE, ELAS analysis and need to determine an effective uniaxial strain. I would therefore like to calculate Mises Stress/Elastic Modulus. This should be sufficient since the material law is elastic.

Thanks and Regards

Gary

Last edited by toltec (2012-06-30 07:45:40)

Thomas DE SOZA · 2012-07-01 23:18:25

If you can afford to use V11 then note that CALC_CHAMP has a neat feature that allows you to compute a field by formula opening a wide range of possibilities. See CHAM_UTIL keyword under CALC_CHAMP.
If you're stuck with V10 then I'm afraid you'll have to do complicated things with CREA_CHAMP if you want to reach your goal.

TdS

toltec · 2012-07-02 08:44:53

Thanks Thomas. I'm stuck with V10 at the moment and have discovered that I can use Paravis Calculator to do the simple processing that I need. I hope to get onto V11 soon.

Cheers

Gary

#1 2010-12-13 02:15:17

How to view principal strains/stresess

#2 2010-12-13 11:21:26

Re: How to view principal strains/stresess

#3 2010-12-13 13:18:36

Re: How to view principal strains/stresess

#4 2010-12-14 00:51:53

Re: How to view principal strains/stresess

#5 2010-12-14 01:13:53

Re: How to view principal strains/stresess

#6 2010-12-14 10:13:01

Re: How to view principal strains/stresess

#7 2010-12-14 11:49:40

Re: How to view principal strains/stresess

#8 2010-12-14 13:12:30

Re: How to view principal strains/stresess

#9 2011-05-27 08:33:23

Re: How to view principal strains/stresess

#10 2011-05-30 06:37:21

Re: How to view principal strains/stresess

#11 2012-06-29 23:47:20

Re: How to view principal strains/stresess

#12 2012-07-01 23:18:25

Re: How to view principal strains/stresess

#13 2012-07-02 08:44:53

Re: How to view principal strains/stresess

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