Pre-stressed structural joint

Details Pre-stressed structural joint Pre-stressed structural joint

1979-08-27

1981-10-13

Kee Chi, James

Joints and connections

Utilizing thermal characteristic, e.g., expansion or...

285381, 285 89, 411132, 411260, 411531, F16B 400, F16D 100, F16L 2500

Patent

active

042945593

ABSTRACT:
The following specification discloses the use of a nickel titanium alloy component referred to as Nitinol for purposes of providing a pre-stressed structure. The alloy component provides stiffness to shell structures and tubular members such as oil well pipes, and conduits, as well as pre-stressed loadings for head bolts on engines or other pre-stressed fasteners. Pre-stressing is accomplished by deforming the Nitinol component below its transformation temperature which can be a cryogenic temperature, after which the Nitinol component returns by its memory to a desired shape for pre-stressing. The foregoing develops a large pre-load on a structural joint, so that successful design applications of Nitinol can pre-load joints with minimum load path offset for a shell or other structure. This minimizes in-plane local moments, as well as eccentric loading, and provides joints of lower weight and less internal volume protrusion.

REFERENCES:
patent: 3150889 (1964-09-01), Watts
patent: 3608933 (1971-09-01), Lee
patent: 3764169 (1973-10-01), St. Clair
patent: 3805567 (1974-04-01), Agius-Sinerco
patent: 4035007 (1977-07-01), Harrison et al.
patent: 4198081 (1980-04-01), Harrison et al.

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