Method of installing interference fit sleeved fasteners having r

Details Method of installing interference fit sleeved fasteners having r Method of installing interference fit sleeved fasteners having r

1990-01-16

1991-01-22

Rosenbaum, Mark

Metal working

Method of mechanical manufacture

Assembling or joining

29524, 295241, 295252, B21D 3900, B23P 1100

Patent

active

049859790

ABSTRACT:
In this fastening system two or more layers of material are fastened together by inserting a hollow sleeved fastener such as a rivet or a bolt into the hole in a high interference fit to expand the hole radially. The sleeve is configured either as a collar and a straight shank or as an angled upper portion combined with a shank for counterbored applications. The intersections between either the collar and the shank or the angle portion and the straight shank are designed with an enlarged radius such that when the sleeve is expanded after the insertion of the fastener inside of it, this radius is expanded, which in turn stress coins the adjacent edge of the hole in the layers. This localized stress coining as well as the hoop stress in the hole surrounding the hole dramatically increases the fatigue strength of the fastened layers in a structure assembly.

REFERENCES:
patent: 2974558 (1961-03-01), Hodell
patent: 3693247 (1972-09-01), Brown
patent: 3820297 (1974-06-01), Hurd
patent: 3951561 (1976-04-01), Speakman
patent: 4244661 (1981-01-01), Dervy
patent: 4296586 (1981-10-01), Heurteux
patent: 4493141 (1985-01-01), Krezak
patent: 4787793 (1988-11-01), Harris
patent: 4789283 (1988-12-01), Crawford
patent: 4815906 (1989-03-01), Binns
"Advanced Fastener Technology for Composite and Metallic Joints," Douglas Paper 7542, E. R. Speakman, Committee E-9 on Fatigue, American Society for Testing and Materials, Charleston, S.C., Mar. 18-19 1985.

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