Applications for Sandwich panels with corrugated cores 2

[frztrb]

Hi Everyone

I would like to ask those of you with the experience in Sandwich panels with corrugated cores with any corrugated geometry , that sometimes in papers I see that they are studied in the sandwich form , I mean they are having their top and bottom layer and sometimes only the mechanical behavior of the corrugated core alone , with no contact on those layers is studied , I wanted to know the actual application of these sturctures how they are positioned and used , with or without top and bottom layers

 

[berkshire]

frztrb,
The only experience I have with panels with Corrugated cores are the Olympic brand panels used in architectural building systems.
Is this what you are referring to?
B.E.

You are judged not by what you know, but by what you can do.

 

[frztrb]

well , not only archtechture , there is a vase study on this type , it should be used in aerospace structures , automotive and marine ? it's immaginable I know , but I want to know where practically , to be able to immagine a loading condition for it

 

[berkshire]

The only problem we had with corrugated core material was a lack of stiffness when the panel was loaded across the direction of the corrugation. Sometimes the inner face sheet would buckle before we thought it should. Essentially there would be no support on the panel at that point. The area between the two I symbols, if my sketch picture comes out right.
--------- V
----------I I--------
VVVVVVVVVVVVVvvvvv
--------------------
-- A ------------ A

B.E.

You are judged not by what you know, but by what you can do.

 

[berkshire]

Well it did not come out quite right The point I was trying to make was that the laminate would bend and kink as if no core were present when bent with the corrugations parallel to the line of bending.
B.E.

You are judged not by what you know, but by what you can do.

 

[frztrb]

thank you so much , yes , it is local buckling , and the thing is analyzing of this phenomenon is very time consuming even with FEM , isn't it ? you make the sandwich panel as stiff as possbile but you do not know if you have also a good resistance against local buckling

 

[berkshire]

that is why the honeycomb, end grain balsa and foam cores do better than the corrugated cores.
B.E.


You are judged not by what you know, but by what you can do.

 

[frztrb]

thanx a lot , but where the corrugated core application is unavoidable ?

 

[RPstress]

NASA CR-1457 "MANUAL FOR STRUCTURAL STABILITY ANALYSIS OF SANDWICH PLATES AND SHELLS" has some info on corrugated cores.

 

[frztrb]

was Perfect ! thank you very much