nonlinear analysis. Large Deflection in a aluminium sheet

[Gwenda]

Hello everyone:

I have a problem with a nonlinear analisis.
I have a aluminium sheet, with a small thick, that is someted a pressure at the top. Also I have the curve stress vs strain.
I want to obtain the stresses and deformations of the sheet, but, when I do the Solve, the program doesn´t finish.
I think, that is because, I must put the pressure by increments, but I don´t know how to do it well.

I asked every people I know, who works with ansys,but a few people, works with nonlinear analysis, so I need help.

 

[Transient1]

What does it do when it exits from the solve? Does it give any kind of error message?

Are you working in classic or workbench?

 

[Struct71]

For large deflection use the command NLGEOM,ON in /solu. It will basically reposition the direction of the external loads after deflection and re-iterate.

 

[Gwenda]

Hi!!
It do nothing, doesnt finish the graphic, for that I supposed that the problem is with the pressure.

In the file ERROR, I have a lot of warnings. I send you one of the file and you can see them, because I´m doing many tests, trying to obtain the solution.

Now I´m trying to do it, dividing the load in 10 steps.

Thanks

Ahhh I´m working with classic, no workbench

 

[timkwan]

It looks like your model is missing some constraints, and is experiencing rigid body motion. For an example of nonlinear analysis, take a look at this tutorial:

http://www.mece.ualberta.ca/tutorials/ansys/IT/NonLinear/NonLinear.html

 

[Gwenda]

Thanks timKwan! I go to do this now.
I thought in some errors in the constrains, but I dont know where, and also maybe, in the calculations about strain and stress...

But first, I´ll try with this tutorial, Thank you very much.