Buckling of honeycomb composite panel
Buckling of honeycomb composite panel
(OP)
Hello All!
I analyze airstructure (elevator) which coitains among other composite sandwich panels. Layup is balanced and symmetrical. In Sol.105 I obtain very strange forms of buckling (see 1.jpg)
http://fil es.enginee ring.com/g etfile.asp x?folder=f 0e0161f-06 e5-4c3e-bd d3-b717e6f ead99& file=1.JPG
After some investigation I discovered that this phenomena occurs as I set G1Z and G2Z of composite materials to definite value. After I had set these values to blank field I obtained quite realistic form (see 2.jpg).
http://fil es.enginee ring.com/g etfile.asp x?folder=9 32d3645-42 00-48c8-bf 58-42358a5 3800b& file=2.JPG
I checked this phenomena also with a simple rectangular specimen. This occurs exactly in the same way.
Moreover result with G1Z and G2Z set to blank corresponds with analytical formulas (which is not surprising though)
So question is: is this result with G1Z and G2Z set to blank realistic and beleivable?
Or just this strange form of buckling indicates some problem with structure (like wrinkling, dimpling etc.)
Thanks
I analyze airstructure (elevator) which coitains among other composite sandwich panels. Layup is balanced and symmetrical. In Sol.105 I obtain very strange forms of buckling (see 1.jpg)
http://fil
After some investigation I discovered that this phenomena occurs as I set G1Z and G2Z of composite materials to definite value. After I had set these values to blank field I obtained quite realistic form (see 2.jpg).
http://fil
I checked this phenomena also with a simple rectangular specimen. This occurs exactly in the same way.
Moreover result with G1Z and G2Z set to blank corresponds with analytical formulas (which is not surprising though)
So question is: is this result with G1Z and G2Z set to blank realistic and beleivable?
Or just this strange form of buckling indicates some problem with structure (like wrinkling, dimpling etc.)
Thanks





RE: Buckling of honeycomb composite panel
What were you setting the G1Z and G2Z as? Was that for the facesheet or the core?
It is possible that transverse shear deformation of the core can significantly affect the result (depending on many variables). If you don't account for it, you may not get an accurate result.
You should be able to model the simple rectangle properly. If you can't get a good result, then you are probably doing it wrong.
You can check it against this solution:
htt
Brian
www.espcomposites.com
RE: Buckling of honeycomb composite panel
Thanks for the link!
RE: Buckling of honeycomb composite panel
RE: Buckling of honeycomb composite panel
My software produced a similar result if the core transverse shear stiffness is low.
Brian
www.espcomposites.com
RE: Buckling of honeycomb composite panel
I try to download ESP solver, but unfortunately zip file is corrupted :(
RE: Buckling of honeycomb composite panel
Brian
www.espcomposites.com