Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations IDS on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Composites and Mechanica

Status
Not open for further replies.

flyerfly

Mechanical
Apr 5, 2006
23
I tried doing a verification model (simply supported beam) today with a composite sandwich and got very different results. Any thoughts?

Method 1: All solid elements were used for both the thick core material and the laminate. The material properties for the core is isotropic (foam) and the laminate is orthotropic. The problem with this is that meshing is poor for such a thin laminate compared to the core.

Method 2: Core was made with solid elements and laminate was done with shell elements (mid plane extraction from above model). The results between the two methods are drastically different (about 5.75x different!).

The deflection with the all solid elements was alot less then that of the shell+solid configuration. I am trying to figure out why and can't think of the reason so far. I would very much appreciate any insight into this.

Thanks!
 
Replies continue below

Recommended for you

I think the shells were attached well...I did a modal analysis to see for sure if the shells would move with the core correctly and it did. The interface during meshing was "pink" so it looks like they were bonded as intended.

Thanks for the link to the mechanica forum.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor