×
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

material orientation in case of laminated tube - NX6

material orientation in case of laminated tube - NX6

material orientation in case of laminated tube - NX6

(OP)
Does anybody know, how to define material orientation for laminated tube in NX6? I´ve already done similar analysis for plate and I was succesful. I know, how to change material orientation using a vector or a coordinate system, but it seems, that the solver has a problem with the two remaining directions, that should be normal and tangent to the circular cross-section. I tried to change to the cylindrical coordinate system while meshing, but it didn´t work. Or, is the problem somewhere else?..:)
Thanks

RE: material orientation in case of laminated tube - NX6

I assume that you're doing your FEM modeling with NX6 Advanced Simulation?

How do you want your material primary directions oriented?  Along the tube axis?

RE: material orientation in case of laminated tube - NX6

Also, is it a shell model (2D elements)?

RE: material orientation in case of laminated tube - NX6

If you set your orientation to be along the tube axis (try creating a CSYS along the axis using Insert > Model Preparation > Coordinate System ... ) then the shell element orientations will be established.  Then, you can create the laminate angular orientations by changing the layup in the laminate modeler.  Make sense?

RE: material orientation in case of laminated tube - NX6

(OP)
to potrero:
Thank you very much for your reply. You´re right, I´m doing this FEM with NX6 Advanced Simulation. The material directions should be parallel to the tube axis. I´m using shell elements CQUAD8. I tried the last tip you suggested, but without any succes. Maybe also wrong material definition of the lamina - there is a lot of options and I have to check it properly. But again, thanks a lot

RE: material orientation in case of laminated tube - NX6

Perhaps, try meshing with CQUAD4 instead (though this shouldn't matter).  Are you sure you are manually setting the mesh orientation (ie: Right-click on the mesh in the Simulation Navigator > Edit Mesh Associated Data > Define Orientation > Select your user-defined CSYS ?)

RE: material orientation in case of laminated tube - NX6

(OP)
to potrero:
Thanks again for your advice! I'm quite sure about setting the mesh orientation :). As you said, I tried to mesh with CQUAD4. There were some warnings but the solution was done. But stil I had to think about putting on CQUAD8, which better represent the geometry. I'm not very sure because I haven't checked the results yet, but hopefully, I figured out the problem. After I defined the material orientation by selecting cylindrical CSYS I also assigned this CSYS to the nodes of the model as a nodal displacement CSYS. It removed error message 9137 from my simulation. I hope I'm not wrong.

RE: material orientation in case of laminated tube - NX6

Despite the fact that CQUAD8's have midpoint nodes and "look" like they "represent the geometry" better, I'm not sure they actually are better finite elements to model the curved surface, than CQUAD4's.  NASA has written some papers on this topic, I seem to recall.

Good to hear you're up and running.

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