×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Aligning SHELL element over a SOLID element

Aligning SHELL element over a SOLID element

Aligning SHELL element over a SOLID element

(OP)
Hi all,

I am hoping that the problem I am facing right now should have a trivial solution. May be I am not hitting it the right way. To simplify the explanation of problem I have simplified the geometric description:

I build a cube whose one end is at (0,0,0) and diagonally opposite end is at (1,1,1). And has meshed it using solid95 element. Now I select the area at height 1 and mesh it with SHELL181 element with uniform thickness of 0.5. When I issue /ESHAPE,1 and EPLOT, I see that SHELL181 element occupies space from height 0.75 to 1.25. I intended to use define this element from height 1 to 1.5. Is there some option or trick for doing that.

Regards
Harry

RE: Aligning SHELL element over a SOLID element

Hi,
I think it's only a matter of selecting only the proper nodes, something like:
ESEL,s,... (select only the underlying elements of interest)
NSLE,s,... (selects the nodes belonging to the selected elements)
NSEL,r,loc,z,1,1.5, (reselects nodes in the range 1 to 1.5 following z-axis of the active coord sys)
<mesh commands>.

Regards

RE: Aligning SHELL element over a SOLID element

Ah, I forgot: if your SOLID95 elements have only midside nodes at the coordinates 1 and 1.5, and have corresponding corner nodes at 0.75 and 1.25, then there is nothing to do: you can not overlay a 2D mesh putting corner nodes over midside nodes. So you would have to remesh more carefully with the SOLID95 elements.

Regards

RE: Aligning SHELL element over a SOLID element

Hello,

I think Harry would like to offset the shells mid plane relative to the shell nodes.

For some shell elements, this ca be done using the real constants (CTOP, CBOT). For other elements (shell181) this should work with the command SECOFFSET.

Regards
Alex

RE: Aligning SHELL element over a SOLID element

(OP)
Hi Guys,

Thank you for your comments. I was having some hardware problem so could not try out your suggestions earlier.

I appreciate cbrn comments, Its good to confirm this. I checked compatibility between the the shell181 and solid95 element and it seems to work fine.

Actually I was looking to offset the nodes from mid plane to bottom plane. SECOFFSET command worked for me using the following lines of codes

ET,2,SHELL181
R,2,2
sectype,1,shell
SECDATA,2, 2, 0, 3
secoffset,bot
aatt,2,2,2,,1

asel,s,loc,y,1
amesh,all

/eshape,1
eplot

Thanks to Alex for his comments.

now the nodes have been offset to the bottom plane and doing a simple static load analysis shows that the shell and the solid element bends together.

Thanks and Regards
Harry

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources