Seite 1 von 1

the pressure is not considered Plate 18 shell 24

Verfasst: Mi 14. Sep 2016, 16:52
von normandajc
z88aurora import only this file z88i1.txt, z88i2.txt, z88i5.txt
it is necessary to give the thickness and the pressure value

I prefer use z88os

I use triangle to generate mesh
https://github.com/drufat/triangle
http://dzhelil.info/triangle/
http://www.cs.cmu.edu/~quake/triangle.html

I write a small python program "b18h.py" to generate this file z88i1 z88i2, z88i5, z88elp, z88mat, z88man
I took as a test, a plate with a hole "plan2d"
I tested the program with plate no. 18 and shell no. 24
Apparently the pressure is not considered

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Fr 16. Sep 2016, 06:59
von normandajc
I'm sorry the pressure is taken into account, but the results are wrong. I have an error in my data, but I do not find.
With the software RDM6 http://iut.univ-lemans.fr/ydlogi/rdm_version_6.html , I get these results. I send you my files
with RDM6, z88os flat 18, shell 24 z88os, plan2d

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Fr 16. Sep 2016, 09:07
von FViebahn
We managed to find the problems.

Plate 18:
The file z88i5.txt was empty. We included a version that works with your project and yields the "same" results as your reference (bear in mind we used a slightly different material). Hint: you can basically use the coi-part of the i1 and swap the element type with the pressure value and put it all in one line.

Shell 24:
The structure definition was wrong. Shell 24 needs to be in 3d and each node has 6 degrees of freedom and also 3 coordinates. So the beginning of the shell24 i1 should look like this:
3 1633 781 9798 0 #AURORA_V2
1 6 +0.000000000000E+000 +0.000000000000E+000 0.0
2 6 +0.000000000000E+000 +1.000000000000E+003 0.0

We hope this helps.

Best regards
FViebahn

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Fr 16. Sep 2016, 15:58
von normandajc
In the user guide,for plate 18 and shell 24 it is written to put 0 in the file z88i5.txt and put in the file z88elp.txt
number of the element parameters
element from element to thichness pressure

It don't follow these guidelines
I put the files with corrections according to your recommendations

Thank you very much for your help

Bests regards

Pierre

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Mo 19. Sep 2016, 08:45
von FViebahn
Hello Pierre,

your last post is not very clear on whether you managed to solve the problem.

Best regards,
FViebahn

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Mo 19. Sep 2016, 18:03
von normandajc
Your advice has been helpful. The files in b24h.zip take into account your remarks and I was able to get good results.
A big thank for your remarks quality.

Best regards

Pierre

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Di 20. Sep 2016, 09:53
von FViebahn
Thank you, we are happy to have helped you.

Best regards
FViebahn

Re: the pressure is not considered Plate 18 shell 24 - T junction

Verfasst: Fr 30. Sep 2016, 07:22
von normandajc
I want to create a junction with 3 plates
I use elements shell type 24
When I launch the solver Z88R, I can't obtain a result.
see files

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Fr 30. Sep 2016, 07:38
von normandajc
sorry I sent the wrong file see file

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Fr 30. Sep 2016, 09:10
von normandajc
I made two scorers for the following files
z88mat.txt number of material data 1 -> 3
z88elp.txt number of element parameters 1 -> 2
but I still have a mistake for the solver

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Fr 30. Sep 2016, 14:00
von SHautsch
Dear normandajc,

this cannot work.

Your structure is invalid, there are overlapping nodes which lead to the elements not being connected and thus your structure is underconstrained -> solver error.
Look at the picture attached below (from Z88Aurora, where I imported your structure for better visualization and Excel to find numbers of the overlapping nodes).

# of nodes your structure has: 48
# of nodes your structure needs: 35 (13 too much)

Overlapping nodes (-> only keep one node per group):
1,7
6, 17, 23, 33, 39
14, 24,40
5,18,34
15,27,43
4,19,35

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Fr 7. Okt 2016, 13:00
von normandajc
Dear SHautsch

Thank you for your help.
I made a new mesh according to your advice.
Solver works, but the result does not seem consistent.
I can not find the error. (See files)

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Mo 10. Okt 2016, 11:20
von SHautsch
Dear normandajc,

same problem: overlapping nodes.

Kind regards,
SHautsch

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Mo 10. Okt 2016, 21:38
von normandajc
Dear SHautsch

Effectively, I made the same mistake.
now I use gmsh instead of triangle to make the mesh
Here is the result

Thank you for your help

Re: the pressure is not considered Plate 18 shell 24

Verfasst: Di 11. Okt 2016, 09:15
von SHautsch
Dear normandajc,

why don't you check for yourself? We can't play this game forever... :roll:

OVERLAPPING NODES!

Kind regards,
SHautsch