Mechanical Properties of Metamaterials and Structures Based on Shape Memory Alloys

Abstract

The relevance of research on metamaterials is driven by the need to create materials with fundamentally new properties not found in nature. The ability to exhibit anomalous mechanical characteristics opens up opportunities for breakthrough applications in various industries. The development of metamaterials based on intelligent alloys, particularly titanium nickelide with a shape memory effect, enables the creation of structures that combine unique geometry with functionality, which is especially in demand for next-generation implants, energyabsorbing systems, and adaptive mechanical components. Purpose: To investigate the mechanical properties of structures made of titanium nickelidebased alloy with a shape memory effect, exhibiting both positive and negative Poisson's ratio values, as elements of metamaterial structures. Methodology: The experiment involved compression tests of two types of wire structures made of Ti-51 at. % Ni alloy. Research findings : It was found that, depending on the structure, the samples exhibited both positive and negative Poisson's ratios. The deformation curves showed almost complete shape recovery of both structures after load removal, which was confirmed experimentally.