Pressure on area 2

[MartinHnv]

Hi!

I am newbie with FEMAP 10 and I have a simple problem. I have simple plate 1000 x 1000 mm and I wish to add pressure on area (200 x 200 mm) locating middle of the plate. How can I do that ?

 

[rb1957]

a simple way is to define the suface to be loaded (as one surface). then surrounding surface to fill out you plate. then mesh all at the same time (so you don't have to fixed co-incident nodes). then applied the load to the appropriate surface.

 

[BlasMolero]

Dear Martin,
I suggest to perfom an imprint of 200x200 in the full plate of 1000x1000, use command "Geometry > Curve - From Surface > Project" to project the curves of a rectangle of 200x200 over the surface of 1000x1000, using this way will allow you to slect the interior surface to prescribe the loading. Try to work always with the geometry.
Best regards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48011 BILBAO (SPAIN)
WEB:

http://www.iberisa.com

 

[MartinHnv]

Thanks BlasMolero!

Your explained very clearly and it worked very well, thanks again.


Best regards,
Martin

 

[MartinHnv]

Hi !

Now I have new problem with this same plate. I did like BlasMolero advised and it worked well but then I decided to delete this loaded area of 200 x 200 and redefine it in another location on the plate. I did all the steps again: projected rectangle area to plate surface, used it to define as loaded area and then after analyze successfully completed It shows that all stresses and deformations are zero, like load is not transferred to nodes.

Then I tried: Tools -> Check -> coincident nodes, number of nodes were merged but simulation result did not change.

What might be the problem?

 

[BlasMolero]

Dear Martin,
Simply delete the mesh and re-mesh again, this command "Project Curves" is not associated to mesh like the ones included in the Meshing Toolbox. Then delete ALL nodes and elementos, use command "Mesh > Mesh Control > Attributes on Surfaces" and re-mesh with "Mesh > Geometry >Surface".

Best regards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48011 BILBAO (SPAIN)
WEB:

http://www.iberisa.com

 

[MartinHnv]

Dear Mr.Molero

I made all from the start:


1) delete mesh and also projected imprint area ( for load definition)
2) remesh
3)New imprint for definition of loaded area
- geometry - curve-line-rectangle
-geometry-curve-from surface -project
4)model -load-on surface
- then I selected created area for load definition, set pressure value 0.02 MPa
5) analyze (static)
- And now again the same problem appeared- shows zero stress and deformation

Is it important to project rectangle curves before or after meshing the surface area of plate?

Actually I tried without rectangle imprint, I just put force on each node in loaded area. It worked but results were peculiar(too large deformation)
and this way It is more difficult I think, It would be easier with imprint area.


Thank you!

Best regards,
Martin

 

[rb1957]

applying nodal forces should give the same results as a distributed pressure ... all the FE does is apply 1/4 of the element pressure at each node (assuming quads)

 

[BlasMolero]

Dear Martin,
Is critical to perform imprint BEFORE the mesh surface command, make sure you delete mesh, then project curves, re-mesh, apply loads and run the analysis, as simply as this.
Best regards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48011 BILBAO (SPAIN)
WEB:

http://www.iberisa.com