Preliminary results of stress recovery of constrained NiTi SMA wire for aerospace applications

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Santos, Julio Cesar ; Da Silva, Antunes Andre ; Pinheiro, Afonso Paulo Monteiro ; Kabayama, Leonardo Kyo ; Rigo, Odair Dona ; Otubo, Jorge ; Gomes, RM ; DeBarros, S ; Torres, SM ; DeLima, SJG ; Melo, TAA ; Buono, VTL

• Tipo de documento: Artigo Científico
• Fonte: Materials Science Forum; v. 643, p. 2-pg., 2010-01-01.

Resumo

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. (AU)

• Processo FAPESP: 06/60849-6 - Desenvolvimento de processo industrial de conformacao de ligas de niquel-titanio.
• Beneficiário: Leonardo Kyo Kabayama
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 00/09730-1 - Desenvolvimento de ligas de NiTi com efeito de memória de forma
• Beneficiário: Jorge Otubo
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores