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#1 2010-12-30 18:58:13

rcbsimoes
Member
Registered: 2010-12-09
Posts: 41

teste case

Hi All,

as i was doing same simple exercises to compare results from Ansys to Code Aster, I found this doc:
http://www1.ansys.com/customer/content/ … a_vm90.pdf

if you look to case VM5, they state the stress at mid-lenght should be 8,333 psi.
i've done the same exercices in Salome Meca, but I cant get the same results.
done it with 2D_plane and 3D solids, both solutions reaching the same results, witch are .59in max displacement, and 50.5kpsi for max stress (von mises).

how came the results are so different??
i belive my solution has converged OK. tested it with diferent meshes and they all came to the same results.
would ansys state a stress witch is not the maximum??

i'll try to attach my files.
rui simoes


Attachments:
VM5.tar.gz, Size: 7.03 KiB, Downloads: 273

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#2 2010-12-30 23:04:21

Claws
Member
From: Denmark
Registered: 2009-03-23
Posts: 375

Re: teste case

I gave D_PLAN a try on some models the other day, and I just gave the ansys wm5 test a try now.
As per your other post http://www.code-aster.org/forum2/viewtopic.php?id=9289 I obtain 16737 / 2 = 8368psi normal-stress (sixx) which is pretty close to the manual target of 8333psi.

I don't know however, how to interpret the displacement. Divided by two as well? I don't even know how to read the Ansys result right now O_o

btw., I've stayed with IPS - haven't tried a conversion to mmNS or MKS

Regards,

Claus

Last edited by Claws (2010-12-30 23:06:58)


Attachments:
WM5_IPS.png, Size: 67.04 KiB, Downloads: 218

Opensuse 15
http://www.caelinux.org/wiki/index.php/Contrib:Claws/Code_Aster

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#3 2010-12-31 01:53:14

rcbsimoes
Member
Registered: 2010-12-09
Posts: 41

Re: teste case

Hi Claus,

could you post me your geo+mesh+comm??

cant reach the same results..

thanks
rui

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#4 2010-12-31 08:14:54

Claws
Member
From: Denmark
Registered: 2009-03-23
Posts: 375

Re: teste case

Why yes, yes I can smile

Regards,

Claus


Attachments:
ANSYS_WM5.zip, Size: 1.06 MiB, Downloads: 225

Opensuse 15
http://www.caelinux.org/wiki/index.php/Contrib:Claws/Code_Aster

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#5 2010-12-31 16:03:55

rcbsimoes
Member
Registered: 2010-12-09
Posts: 41

Re: teste case

thanks claus!!!

the difference was, you used force_nodal and i was using a force_contour applied to an edge.

i thought this contour force, would divide the force by the edge length and minor the local deformation and increase in stress...
apparently i was wrong! changed it to force nodal and there it was, SAME RESULT as you and as Ansys.

thanks again for your help!
rui

ps. happy new year!

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