Tailoring mechanical properties in 3D printed multimaterial architected structures

Abstract

In recent years, significant advancements have been made in developing architected materials, known for their benefits like being lightweight, customizable mechanical performance, and excellent energy absorption. The capabilities of 3D printing technology have facilitated the emergence of a diverse range of architected structures, featuring various unit cell types and geometries for different applications. This study explores the unique opportunity offered by multimaterial 3D printing in fine-tuning the mechanical performance of architected structures. The exploration of the programmability of these structures involves a systematic assessment of various material candidates. After careful evaluation, the selection process led to the choice of PLA and PCL biopolymers for the multimaterial structure. Experimental results emphasize the key role of design configurations in influencing mechanical characteristics, particularly in enhancing the energy absorption capacity of architected structures. By skillfully manipulating the local structure and composition through the synergistic combination of soft and hard materials, the study demonstrates the ability to achieve a diverse range of mechanical responses. The discovered insights present a promising approach that holds applicability in the design and development of multifunctional devices. This is especially significant in the biomedical field, where there is a growing demand for versatile devices.