About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Presentation Title |
Mechanical Behavior of an Additively Manufactured Psuedoelastic Nitinol |
Author(s) |
Patxi Fernandez-Zelaia, Chris Ledford, Chris Fancher, Sarah Graham, Taresh Guleria, Brad Sampson, Fred List, Jason Mayeur, Chins Chinnasamy, Mohammad Elahinia, Michael M Kirka |
On-Site Speaker (Planned) |
Patxi Fernandez-Zelaia |
Abstract Scope |
Shape memory alloy complex geometries fabricated via additive manufacturing enable the use of functional systems across a variety of fields. This work focuses on the mechanical behavior of an additively manufacturing pseudoelastic NiTi. Pseudoelastic deformation, which can accommodate large reversible strains, is fundamentally driven by crystal-scale solid-state transformation physics. During fusion-based laser powder bed processing the resulting microstructure is observed to be strongly dependent on the process history. Exhaustive mechanical testing demonstrates that microstructural factors, both grain morphology and crystallographic texture, strongly influence tensile and cyclic stress–strain behavior. In-situ observed spatial strain fields reveal the occurrence of two different localization mechanisms: (1) deformation bands which continuously propagate through the tensile bar and (2) grain-scale localization driven by crystal deformation physics. Both phenomena drive the resulting aggregate constitutive behavior. These structure-property relations are essential for the effective design and manufacture of pseudoelastic functional components. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |