Multiple density sandwich structures

Details Multiple density sandwich structures Multiple density sandwich structures

1995-06-07

1996-07-09

Zimmerman, John

Stock material or miscellaneous articles

All metal or with adjacent metals

Honeycomb, or with grain orientation or elongated elements...

428594, 428636, 428660, 244123, B32B 328, B32B 1500, B64C 320

Patent

active

055343546

ABSTRACT:
A method to superplastic form sandwich structures is provided. A series of worksheets are joined together at selected locations through the use of partial penetration welding. The worksheets are subsequently superplastic formed in order to form a sandwich structure. The method allows a different number of worksheets to be used at different points throughout the sandwich structure. This results in a sandwich structure with a different internal reinforcement at different locations in the sandwich structure. In the preferred embodiment, a wing is fabricated from a series of worksheets partial penetration welded together using a laser. The worksheets are superplastic formed to producing a wing with a different internal reinforcement at two or more locations in the wing. The wing includes a pair of double thickness skins that define a major portion of aerodynamically smooth outer surface of the airfoil. Each skin is formed from at least two sheets of superplastically formed material that are joined by diffusion bonding. The internal reinforcement extends between the surface's interior surfaces of the skins and are welded to the skins by wave welds. The webs of the internal reinforcement extend between the skins diagonally and each web is formed of a single sheet of superplastically formed material.

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