Method of forming fiber-reinforced epoxy composite joints, and p

Details Method of forming fiber-reinforced epoxy composite joints, and p Method of forming fiber-reinforced epoxy composite joints, and p

1974-12-09

1977-03-29

Powell, William A.

Stock material or miscellaneous articles

Sheets or webs edge spliced or joined

Sheets or webs coplanar

156158, 156159, 156629, 156633, 428195, B32B 310, B32B 512, B29C 1708, B65H 6902

Patent

active

040150356

ABSTRACT:
An improved manufacture including a fiber-reinforced epoxy composite joint, and the method for producing same, in which the fibers of each of the composite adherends pass through and are intermeshed across the joint bondline. A scarfed mating surface is prepared on the end of each of the adherend elements-to-be-joined, after which a chemical etching of the mating ends to obtain exposed lengths of filaments or fibers is provided. A sheet of unsupported adhesive material is inserted between the scarfed and etched mating surfaces prior to their layup, after which heat and pressure are applied for bonding the joint. The exposed fibers of each element cross the bondline to intermesh with those of the other element during the melting of the unsupported adhesive. This process increases the joint efficiency to 83% of the efficiency of a non-joined element.

REFERENCES:
patent: 3195219 (1965-07-01), Woodcock et al.
patent: 3431157 (1969-03-01), Mack
patent: 3481807 (1969-12-01), Kanamori
patent: 3487871 (1970-01-01), Kanamori
patent: 3689341 (1972-09-01), Ninomiya
patent: 3770555 (1973-11-01), Gladstone et al.
IBM Technical Disclosure Bulletin, F. Anzalone et al., "Chemically Producing Holes in Epoxy Glass Material", vol. 10, No. 7, 12/67.

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