Compression Behavior and Failure Mechanisms of Bionic Porous NiTi Structures Built via Selective Laser Melting

Abstract

Inspired by the crystal microstructure of metals and the bamboo, the bionic porous NiTi structures with the porosities in the range of 75.8%-84.9% were built via selective laser melting (SLM). The compression behavior and the failure mechanisms of the porous NiTi structures were evaluated. It demonstrated an increase in the elastic modulus and ultimate strength when the porosity was decreased, from 3.06 to 7.66 GPa and from 34.1 to 147.6 MPa, respectively. The relationship between the elastic modulus and the porosity obtained by the finite element analysis exhibited similar tendency with the experiment, and agreed well with the Gibson-Ashby model's prediction. Based on the theoretical model above and the observation of the deformation processing, the plastic deformation behavior and failure mechanisms of the SLMed porous NiTi structures were analyzed.

New Insights into the Mechanical Properties, Functional Fatigue, and Structural Fatigue of Ni-Ti Alloy Porous Structures

“…Likewise, Zhang et al [21] fabricated biomimetic porous Ni-Ti structures with different porosities by SLM. The compression behavior of porous Ni-Ti structures and the failure mechanism were evaluated.…”

“…In recent years, some scholars have focused on the research and development of mechanical response models, martensitic cyclic phase transformation models and fatigue damage models. The porous Ni-Ti structures were designed and prepared by Zhang et al [21] by the SLM method. A combination of compression experiments and finite element analysis was used to investigate the effect of the compressive behavior of porosity porous Ni-Ti structures.…”

Effect of Lattice Structure on Mechanical Properties of Ti-6Al-4V-Ta Alloy for Improved Antibacterial Properties

“…For instance, Ti-Ta alloy lattice structures produced using laser powder bed fusion (L-PBF) exhibit superior fracture energy and mechanical performance, making them highly suitable for orthopedic applications [9]. Furthermore, Nitinol, a nickel-titanium alloy known for its superelasticity and shape memory effects, has emerged as a significant material for various medical devices, including orthopedic implants and vascular stents [10]. Ongoing research aims to optimize Nitinol's processing techniques to further improve its mechanical properties and corrosion resistance, ensuring its durability and functionality in clinical applications [11].…”