Preliminary Results of Stress Recovery of Constrained NiTi SMA Wire for Aerospace Applications

Abstract:

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The rocket propellant ignition system uses electro-explosive device actuated by wire electrode. Those wires are usually made by Fe-Ni based alloy with controlled thermal expansion inserted into a ceramic feed-through and are connected to thin resistive wire which is heated through the passage of an electrical current for propellant ignition. The contact between ceramic feed-through and wires should be reliable since sometimes it could fail. A novel alternative process is to use SMA wires taking into account the shape recovery effect constraining the wire inside the feed-through. The recovery stress of 326 MPa for 4% pre-strain should be enough to constrain the wire inside the feed-trough avoiding the gas leakage.

Info:

Periodical:

Edited by:

Rodinei M. Gomes, Silvio de Barros, Sandro M. Torres, Severino Jackson G. de Lima, Tadeu A. A. Melo, Vicente T. Lopes Buono

Pages:

15-18

DOI:

10.4028/www.scientific.net/MSF.643.15

Citation:

J. C. Santos et al., "Preliminary Results of Stress Recovery of Constrained NiTi SMA Wire for Aerospace Applications", Materials Science Forum, Vol. 643, pp. 15-18, 2010

Online since:

March 2010

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Price:

$35.00

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