4d Printing Sma-Based Bio-Inspired Metamaterial with Adjustable Mechanical Properties

Abstract

Mechanical metamaterials which are artificially and intelligently designed have attracted significant interest due to their multilayer lattice structure and exceptional mechanical capabilities. A metamaterial with controllable shape and mechanical characteristics is presented based on shape memory alloy 4D printing and the imitation of the microstructure of human bones through biomimicry. Three configurations were achieved by modifying structural configuration, and each of them possesses distinct mechanical properties that offer exceptional and customizable capabilities in energy absorption and vibration isolation. A combined approach of theoretical modeling, finite element analysis and experimental methodologies was utilized to investigate the shape reconstruction and adjustable mechanical behavior of the metamaterial. A comprehensive analysis was conducted to compare stress-strain relationships, energy absorption effects and vibration isolation performance under different pre-programmed configurations and a broad temperature range. The findings indicate that the metamaterial possesses a remarkable capacity for shape reconstruction. By adjusting and controlling the structural parameters, configuration and ambient temperature of the metamaterial, adaptive optimization and regulation of the mechanical properties, vibration control and energy absorption can be achieved. The 4D-printed shape memory alloy bio-inspired metamaterial has potential applications in energy absorption and vibration isolation for aerospace structures.

Keywords: Shape memory alloy, 4D printing, Adjustable mechanical properties, Energy Absorption, Vibration isolation