Stock material or miscellaneous articles – Structurally defined web or sheet – Including sheet or component perpendicular to plane of web...
Patent
1996-06-06
1997-06-17
Thomas, Alexander
Stock material or miscellaneous articles
Structurally defined web or sheet
Including sheet or component perpendicular to plane of web...
428120, 428122, 244123, 244131, 156182, B32B 310, B32B 700
Patent
active
056395353
ABSTRACT:
A method for fabricating composite parts having improved pull-off strengths between portions of the composite part. In one embodiment, a sine wave spar is formed from two U-shaped channels having opposing flanges and a central web. The U-shaped channels are joined along the webs. The triangular gap created between the edges of the two U-shaped channels along the joining surface are filled by interleaving layers of unidirectional prepreg with the layers of prepreg that form the caps or flanges of the sine wave spar. In one embodiment of the invention, the layers of prepreg used as radius filler plies become progressively narrower as they are interleaved from within the gap outward towards the outer edge of the flanges. In another embodiment, the layers of prepreg used as radius filler plies become progressively narrower as they are interleaved between the cap plies.
REFERENCES:
patent: 1473842 (1923-11-01), Frederick
patent: 4113910 (1978-09-01), Loyd
patent: 4177306 (1979-12-01), Schulz et al.
patent: 4606961 (1986-08-01), Munsen et al.
patent: 5096525 (1992-03-01), Engwall
The Boeing Company
Thomas Alexander
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