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A very low shock alternative to conventional, pyrotechnically operated release devicesNiTiNOL is best known for its ability to remember a preset shape, even after being 'plastically' deformed. This is accomplished by heating the material to an elevated temperature up to 120 degrees C. However, NiTiNOL has other material and mechanical properties that provide a novel method of structural release. This combination of properties allows NiTiNOL to be used as a mechanical fuse between structural components. When electrical power is applied to the NiTiNOL fuse(s), the material is annealed reducing the mechanical strength to a small fraction of the as-wrought material. The preload then fractures the weakened NiTiNOL fuse(s) and releases the structure. This paper describes the mechanical characteristics of the NiTiNOL allow used in this invention, structural separation design concepts using the NiTiNOL material, and initial test data. Elimination of the safety hazard, high shock levels, and non-reusability inherent with pyrotechnic separation devices allows NiTiNOL actuated release devices to become a viable alternative for aerospace components and systems.
Document ID
19960020700
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Robinson, Steven P.
(Boeing Defense and Space Group Seattle, WA United States)
Date Acquired
August 17, 2013
Publication Date
February 1, 1994
Publication Information
Publication: The 2nd NASA Aerospace Pyrotechnic Systems Workshop
Subject Category
Propellants And Fuels
Accession Number
96N24223
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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