Sandwich core panel having cured face sheets and a core formed with projecting modes

DETAILED DESCRIPTION I claim: 1.
A sandwich panel comprising: first and second curved face sheets and a core formed from projecting nodes sandwiched between said face sheets, said core nodes having end face portions, the end face portions of the nodes being excised at the central part thereof, the remaining portions of said node end face portions forming flanges which are bent away from the center plane of the core and the longitudinal axes of their respective nodes, said flanges being joined to the panel face sheets and conforming to the contour thereof.
2.
The sandwich panel of claim 1 wherein said flanges are in the form of a conical section.
3.
The sandwich panel of claim 1 wherein said flanges are in the form of an ellipsoidal section.
4.
The panel of claim 1 wherein the excised portions of the node end faces are elliptical in shape.
5.
The sandwich panel structure of claim 1 wherein said flanges are brazed to the face sheets.
6.
The sandwich panel structure of claim 1 wherein said flanges are bonded to the face sheets.
7.
The sandwich panel structure of claim 1 wherein said core is formed from oppositely projecting nodes.




Description:
This invention relates to sandwich core panels, and more particularly to such panels having a core formed from projecting nodes, the end faces of which are in the form of flanges.
In my U.
S.
Pat.
Nos.
3,525,663 and 3,527,664, sandwich core panel structures are described which are formed from a core of projecting nodes with the end faces of these nodes being attached to the panel face sheets.
Where forming such panel structures with single or double curved face sheets, it is necessary, particularly where brazing is utilized, that the core be bent to the contours of the ultimate sandwich panel shape, and that the node terminals are machined to conform to the face sheet contour.
This operation is both costly and difficult.
The present invention overcomes the aforementioned problem of the prior art in a simple and effective manner which obviates the need for machining the node end faces, at the same time assuring that the finished panel has an adequate bond integrity