FEMAP Variable load on curved Plate

[inarus]

Hello all!

I have a curved shell as in the picture bellow.
How should I proceed ...

 

[ThomasH]

Hi

Is it something like a waterpressure? Would load as function of a coordinate solve the problem?

Regards

Thomas

 

[inarus]

Hello Thomas,

Thanks for your reply.
Is not quite water pressure exactly, it's a design pressure imposed by the rules (Lloyd's) that include hydrostatic pressure too.

The picture in the previous post is a section trough a ship shell, and I need to load that pressure on a 1.4 meters wide (on X axis) curved plate with different thicknesses strengthened with various transverse and longitudinal stiffeners.

My dumb solution would be to split the shell in multiple surfaces and load them incremental from 30 kN/m2 to 70 kN/m2.

My teacher gave me this FEMAP sequence (he didn't had time to explain much...)

− Tools / Define Variables
Variable name: !EL
Value of Equations: ACTID(9) - a function that identifies the elements in the data base - (he said... also that ACTID(9) is a label)
<OK>
− Model / Load / Elemental / Pressure
Direction: Normal to Element Face
Method: Variable
Advanced / Variable: EL
Value / Pressure: 0.01*(numeric value of height.-ZEL(!EL)) where ( Z-vertical)
Selection Info / Face: 1
<OK>

Well, I hope my problem is better defined now.

Thank you!

 

[ThomasH]

inarus

Since you mention yout teacher I have to assume that you are a student. Student posting i prohibited in the forum as you should know.

However, since your question is fairly straightforward I will try to help anyway. I just hope that I don't break any rules now .

To define an element pressure based on the elements center z-koordinat you can write Pressure: 10000*zel(!i). Method-Variable- Klick advanced but don't change anything in that dialog. The parameter of interest is the ID Variable i, it defines the element number that you adresss with !i and the result is the element z-coordinate that is used in the equation. And the equation can of course be more complex.

There are other variables but those you should know already.

This is a simplification of your teachers method.

Good Luck

Thomas