Superelastic response and damping behavior of additively manufactured Nitinol architectured materials

• DOI: 10.1016/j.addma.2023.103505
• Publication Date: 2023-03-17T16:23:07Z
• Authors: Zhaorui Yan; Jia-Ning Zhu; Evgenii Borisov; Ton Riemslag; Sean Paul Scott; Marcel Hermans; Jovana Jovanova; Vera Popovich
• Keywords: 0203 mechanical engineering; Additive manufacturing; Energy absorption; 621; Tailored damping; 02 engineering and technology; Architectured material; 7. Clean energy; NiTi

In energy absorption applications, architectured metallic materials generally suffer from unrecoverable deformation as a result of local yield damage or inelastic buckling.Nitinol (NiTi) offers recoverable and dissipation due to its unique superelasticity, which can change the way we design additively manufacture energy-absorbing materials.The interplay between microstructure, mesoscopic deformation, macroscopic thermomechanical response NiTi is still not studied in depth.In this work, featuring anisotropic superelastic response, damping were successfully modeled manufactured using laser powder bed fusion (L-PBF).Extensive numerical models demonstrated that exhibit temperature-dependent superelasticity effective transformation stress be controlled by relative density cell architecture.An surface was developed based on extended Hill's model, illustrating anisotropy temperature-independent.Stable cyclic behavior with 2.8 % reversible strain achieved compressive tests without yielding plastic buckling, further illustrates progressive martensitic main mechanism.A comparative study designed herein body centered cubic (BCC) octet structures showed microstructures significantly affect modes.The integrated computational experimental enables tailoring combining structural microstructural control.Architectured are potentially applicable reusable impact absorbers aerospace, automotive, maritime vibration-proof structures.