the pressure is not considered Plate 18 shell 24
Moderatoren: ccad, mz15, auroraIco, Lehrstuhl
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the pressure is not considered Plate 18 shell 24
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
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
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- plan2d_with_shell_24.zip
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- plan2d_with_plate_18.zip
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Re: the pressure is not considered Plate 18 shell 24
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
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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Re: the pressure is not considered Plate 18 shell 24
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
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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Re: the pressure is not considered Plate 18 shell 24
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
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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Re: the pressure is not considered Plate 18 shell 24
Hello Pierre,
your last post is not very clear on whether you managed to solve the problem.
Best regards,
FViebahn
your last post is not very clear on whether you managed to solve the problem.
Best regards,
FViebahn
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Re: the pressure is not considered Plate 18 shell 24
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
A big thank for your remarks quality.
Best regards
Pierre
Re: the pressure is not considered Plate 18 shell 24
Thank you, we are happy to have helped you.
Best regards
FViebahn
Best regards
FViebahn
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Re: the pressure is not considered Plate 18 shell 24 - T junction
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
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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Re: the pressure is not considered Plate 18 shell 24
sorry I sent the wrong file see file
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- Tjunction2.zip
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Re: the pressure is not considered Plate 18 shell 24
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
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
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
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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Re: the pressure is not considered Plate 18 shell 24
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)
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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Re: the pressure is not considered Plate 18 shell 24
Dear normandajc,
same problem: overlapping nodes.
Kind regards,
SHautsch
same problem: overlapping nodes.
Kind regards,
SHautsch
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- overlapping-nodes.JPG
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Re: the pressure is not considered Plate 18 shell 24
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
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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Re: the pressure is not considered Plate 18 shell 24
Dear normandajc,
why don't you check for yourself? We can't play this game forever...
OVERLAPPING NODES!
Kind regards,
SHautsch
why don't you check for yourself? We can't play this game forever...
OVERLAPPING NODES!
Kind regards,
SHautsch
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- overlapping-nodes-gmsh.PNG
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