topic Re: Water tank with varaible walls thickness in Robot Structural Analysis Forum

Water tank with varaible walls thickness

MUHANNAD.ABU_ABDO — Sun, 19 Mar 2017 20:11:59 GMT

Hello to all .. i'm trying to simulate deep water tank with 27.5 m diameter & 25 m depth , but the thickness is changed every 5 meter start of 1.5 m at end to 0.3 m at top as in the pic below , i modeled the tank as solid using Revolve and i want to check if the shear stress is within allowable limits and walls thickness enough or not ! can someone help me with this issue ?

Thanks in advance

Re: Water tank with varaible walls thickness

Mohammed_Ata — Sun, 19 Mar 2017 20:41:21 GMT

I think you have 2 options:

1- Draw each 5.00m vertical strip individually, then you have a thickness per each!

2- You can use option (variable thickness along line) as shown, it presents linear variable thickness!

Re: Water tank with varaible walls thickness

MUHANNAD.ABU_ABDO — Sun, 19 Mar 2017 20:46:30 GMT

i already made the model ! i didn't mean the thickness is variable along the wall ( Linear ) i meant as in the pic below

Re: Water tank with varaible walls thickness

Mohammed_Ata — Sun, 19 Mar 2017 21:49:45 GMT

I don't think so as RSA draws the area section from its geometric center!

Re: Water tank with varaible walls thickness

MUHANNAD.ABU_ABDO — Sun, 19 Mar 2017 21:51:23 GMT

Check the model file in the first post !

Re: Water tank with varaible walls thickness

Artur.Kosakowski — Mon, 20 Mar 2017 08:00:59 GMT

Have you considered modelling the tank as a solid?

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Re: Water tank with varaible walls thickness

MUHANNAD.ABU_ABDO — Mon, 20 Mar 2017 10:34:50 GMT

Yes i did .. check the model in the link below ..

https://www.mediafire.com/?9alhqepy44ogh58

Thanks in advance

Re: Water tank with varaible walls thickness

Artur.Kosakowski — Mon, 20 Mar 2017 11:34:21 GMT

I'd say you need more elements for the precision of the solution e.g. increase number of divisions for revolving to 240 and have more elements across the wall thickness specially for the top part where you have only one row of solid (mesh) elements. You may also consider using the axisymmetric structure model instead.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

Re: Water tank with varaible walls thickness

MUHANNAD.ABU_ABDO — Mon, 20 Mar 2017 11:43:32 GMT

thanks for your response .. i tried to do it using axisymmetric structure ! but i failed ! due to that i used volumteric structure design .. Could you give me small video or hint how i can do it using axisymmetric ,, your help is highly appreciated

Thanks in advance

Re: Water tank with varaible walls thickness

Artur.Kosakowski — Mon, 20 Mar 2017 12:55:36 GMT

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

Re: Water tank with varaible walls thickness

MUHANNAD.ABU_ABDO — Mon, 20 Mar 2017 13:46:28 GMT

Many thanks .. this is useful .. is it possible to make revolve for this panel ?

Re: Water tank with varaible walls thickness

Artur.Kosakowski — Mon, 20 Mar 2017 13:52:38 GMT

The whole point for this structure type is to work with such reduced size model as the behavior of the structure is identical at any point of the 'circle' but you can crate a panel like this and revolve it to create a solid model (in this case you should start with a solid model type).

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

Re: Water tank with varaible walls thickness

MUHANNAD.ABU_ABDO — Mon, 20 Mar 2017 14:05:12 GMT

i can't find the nature of load !

thanks for your efforts .. i appreciate that

Re: Water tank with varaible walls thickness

Artur.Kosakowski — Mon, 20 Mar 2017 14:19:46 GMT

Could you attach your model?

Re: Water tank with varaible walls thickness

MUHANNAD.ABU_ABDO — Mon, 20 Mar 2017 14:26:48 GMT

Here is the model

Re: Water tank with varaible walls thickness

Artur.Kosakowski — Mon, 20 Mar 2017 14:47:31 GMT

I can't see any issue:

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

Re: Water tank with varaible walls thickness

MUHANNAD.ABU_ABDO — Mon, 20 Mar 2017 14:49:41 GMT

i tried to put the loads but it didn't work

Re: Water tank with varaible walls thickness

Artur.Kosakowski — Mon, 20 Mar 2017 15:02:50 GMT

What kinds of loads exactly?

Re: Water tank with varaible walls thickness

MUHANNAD.ABU_ABDO — Mon, 20 Mar 2017 15:09:26 GMT

Water pressure

Re: Water tank with varaible walls thickness

Artur.Kosakowski — Mon, 20 Mar 2017 15:44:46 GMT

I believe I defined linearly varying load in the video I attached to my previous answer. Do you have any issue to define such load yourself?