| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Advanced Joining Technologies for Automotive Lightweight Structures
|
| Presentation Title |
Design of Shape Memory Wire Actuators by Impact Welding |
| Author(s) |
Biswanath Paira, Boyd Panton, Anupam Vivek, Brian Thurston, Glenn Daehn |
| On-Site Speaker (Planned) |
Boyd Panton |
| Abstract Scope |
In this study, vaporizing foil actuator welding was used to fabricate dissimilar welds between an equiatomic NiTi shape memory alloy (SMA) wire and a brass sheet. This was attained while maintaining the shape memory properties of NiTi wire and without creating a large heat-affected zone or intermetallic compounds at the interface that are typically formed during conventional fusion welding of such materials.
Multi-channel Photon Doppler Velocimetry (PDV) was used to measure the key process parameters of impact speed and angle. The composition and morphology of the weld interface were characterized with scanning electron microscopy. The typical wavy morphology with negligible formation of intermetallics was observed. The mechanical strength of the joint was measured using lap shear testing along with a custom fixture to demonstrate mechanical actuation. The joint efficiency was estimated to be 90%. A multi-wire assembly of such welded SMA wires will be applied for an aerospace application. |