Aram J Dervy

US Patent:

42446619, Jan 13, 1981

Filed:

Jul 23, 1979

Appl. No.:

6/059535

Inventors:

Aram J. Dervy - Santa Monica CA

Assignee:

McDonnell Douglas Corporation - Long Beach CA

International Classification:

F16B 900

US Classification:

403243

Abstract:

A galvanically compatible flanged sleeve is inserted within a close fitting hole in a structural joint wherein at least one of the structural members is a composite laminate. The sleeve is then expanded outwardly into a high interference fit by the insertion of a fastener therethrough. The sleeve may be of the split type and when such is used, a washer can be provided underneath the flange to prevent damage to the underlying laminate surface. Teflon coated shims may be placed between the mating surfaces of the adjacent structural members heldtogether by the joint when the stress excursions are to be applied to high levels and/or with frequency. Joints so formed of graphite/epoxy laminate have fatigue strengths approaching the ultimate static strength of the joint.