the pressure is not considered Plate 18 shell 24

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normandajc
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the pressure is not considered Plate 18 shell 24

Beitrag 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
Dateianhänge
plan2d_with_shell_24.zip
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plan2d_with_plate_18.zip
(85.69 KiB) 116-mal heruntergeladen

normandajc
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Re: the pressure is not considered Plate 18 shell 24

Beitrag 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
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error.zip
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FViebahn
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Beiträge: 50
Registriert: Di 11. Dez 2012, 08:24

Re: the pressure is not considered Plate 18 shell 24

Beitrag 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
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pressure.zip
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normandajc
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Registriert: Sa 10. Sep 2016, 06:31

Re: the pressure is not considered Plate 18 shell 24

Beitrag 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
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b24h.zip
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FViebahn
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Registriert: Di 11. Dez 2012, 08:24

Re: the pressure is not considered Plate 18 shell 24

Beitrag von FViebahn »

Hello Pierre,

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

Best regards,
FViebahn

normandajc
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Re: the pressure is not considered Plate 18 shell 24

Beitrag 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

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FViebahn
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Registriert: Di 11. Dez 2012, 08:24

Re: the pressure is not considered Plate 18 shell 24

Beitrag von FViebahn »

Thank you, we are happy to have helped you.

Best regards
FViebahn

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

Beitrag 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
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T_junction.zip
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normandajc
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Re: the pressure is not considered Plate 18 shell 24

Beitrag von normandajc »

sorry I sent the wrong file see file
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Tjunction2.zip
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normandajc
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Re: the pressure is not considered Plate 18 shell 24

Beitrag 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

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SHautsch
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Registriert: Mo 15. Apr 2013, 11:03

Re: the pressure is not considered Plate 18 shell 24

Beitrag 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
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overlapping_nodes_excel.PNG
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overlapping_nodes.PNG
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normandajc
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Registriert: Sa 10. Sep 2016, 06:31

Re: the pressure is not considered Plate 18 shell 24

Beitrag 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)
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G.zip
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SHautsch
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Registriert: Mo 15. Apr 2013, 11:03

Re: the pressure is not considered Plate 18 shell 24

Beitrag von SHautsch »

Dear normandajc,

same problem: overlapping nodes.

Kind regards,
SHautsch
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overlapping-nodes.JPG
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normandajc
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Re: the pressure is not considered Plate 18 shell 24

Beitrag 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
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avecgmsh.zip
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SHautsch
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Beiträge: 380
Registriert: Mo 15. Apr 2013, 11:03

Re: the pressure is not considered Plate 18 shell 24

Beitrag von SHautsch »

Dear normandajc,

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

OVERLAPPING NODES!

Kind regards,
SHautsch
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overlapping-nodes-gmsh.PNG
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