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

Júlio Cesar Santos; Antunes Andre Da Silva; Afonso Paulo Monteiro Pinheiro; Leonardo Kyo Kabayama; Odair Doná Rigo; Jorge Otubo

doi:10.4028/www.scientific.net/MSF.643.15

Paper Titles

Preface

Processing Methodology to Embedding NiTi Shape Memory Fibers into a Polymer-Based Composite Plate
p.1

Vibration Attenuation in an Epoxy Smart Composite Beam with Embedded NiTi Shape Memory Wires
p.7

Preliminary Results of Stress Recovery of Constrained NiTi SMA Wire for Aerospace Applications
p.15

Thermal Activation of CFRP with Embedded NiTi Shape Memory Wires
p.19

Manufacture and Electro-Thermomechanical Characterization of a SMA Copper-Based Cylindrical Connector
p.29

Dynamic Properties of NiTi Shape Memory Alloy and Classic Structural Materials: A Comparative Analysis
p.37

Influence of Thermomechanical Processing on the Martensitic Transformation Temperatures of NiTi SMA Wire
p.43

Precipitates Formation in Ti-Ni Equiatomic Alloys due to Annealing Heat Treatment
p.49

HomeMaterials Science ForumMaterials Science Forum Vol. 643Preliminary Results of Stress Recovery of...

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

Abstract:

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.