Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1981-09-24
1985-02-26
Moon, Charlie T.
Metal working
Method of mechanical manufacture
Assembling or joining
29447, 29526R, 285381, 403273, 411147, B23P 1102
Patent
active
045010587
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: 3803793 (1974-04-01), Dahl
patent: 3900939 (1975-08-01), Greacen
patent: 4126758 (1978-11-01), Krumme
patent: 4149911 (1979-04-01), Clabburn
patent: 4281841 (1981-08-01), Kim et al.
patent: 4297779 (1981-11-01), Melton et al.
Bethel George F.
Bethel Patience K.
Moon Charlie T.
PDA Engineering
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