Consecutive oscillating movements

General Questions
1

HI,

First of all, congratulations for the software. It, runs very soft and it is very intuitive.

I’m trying to impose too consecutive oscillating movements , one on each side of a thin plate.

The analysis runs for 2 seconds. From 0 to 1 second oscillates one side and from 1 to 2 seconds the other side should oscillate.

Three comments about my result. (File attached)

1- I have probably set up something wrong but I can’t figure what is it.

Oscillation from second 1s to 2s has some issue. It is not oscillating in the right direction Y as the other side correctly does.

2-I would like if possible that the Animation properties were saved with the file.

3-I’m not able to set my Solid_part-1 opaque and I can see some annoying lines from the other side of the mesh.

Thanks

screenshot.81
screenshot.811163×566 375 KB

Test Loads Shifted in Time.pmx (2.2 MB)

2

Another comment.

¿How can I change/reasign my loaded area?. The “more button” on “Set Selection” for the BC is not available now.

screenshot.82
screenshot.82667×738 76.6 KB

3

Here are a few thoughts:

  1. I’d rather use dynamic analysis in this case.
  2. Is there a reason not to use shell elements for this very thin part ?
  3. I would try doing this in 2 separate steps.
  4. Try with a different solver. PaStiX may still show unexpected behavior in some cases.

You can still use geometry based selection or create a node set and assign the BC to it (change Region type to Node set name).

4

Ok, I will try,

Thanks

5

One more thing - setting displacement BC back to zero doesn’t freeze the nodes in their current position but returns them to their initial position instead.

6

Very thin solid meshes produce this undesired effect. I tried solving it but was not very successful. It is a bit better from version 1.3.0 in comparison to older versions but it still shows.

7

Yesterday I was finally able to solve it remeshing.
I guess if shell issues could be solve expanding with two elements per thickness.?¿? :face_with_monocle:

8

There’s also one true shell element recently added to CalculiX. You can give it a try but it has some limitations.

9

I will try too. Thanks both for the help.