Mechanics of architected materials across length and time scales

Abstract

Architected materials (or mechanical metamaterials) across length scales--from nanometers to centimeters-- have enabled previously unachievable mechanical properties through a variety of 3D material morphologies. Significant advances in our understanding of these materials have thus pointed to structure-property relations that lead to unique macroscopic mechanical properties. Despite this progress, several hurdles have precluded widespread application of these materials to solve engineering challenges. First, clear routes to scalably design and fabricate these architected materials have remained elusive; with most designs reported to date targeting high stiffness but low deformability. Second, since most of the studies to date have characterized architected materials under quasi-static deformation, their dynamic-property regime remains to be fully characterized and understood--essential to a variety of envisioned applications. In this talk, we present efforts towards addressing these long-standing challenges, specifically by proposing routes for designing architected materials with extreme compliance and by presenting two types of high-throughput characterization methods that enable exploration of architected materials under dynamic conditions. We discuss efforts implementing and understanding compliant architected materials by proposing metamaterial design paradigms inspired by polymer-network architectures. We also present efforts performing non-contact characterization of materials through laser-induced vibrational signatures, providing a new route to uncover dynamic elastic responses of materials and unparalleled throughput rates. Lastly, we discuss efforts characterizing architected materials under extreme dynamic conditions through use of microparticle impact experiments at the microscale, shedding light on energy dissipation mechanisms that emerge from the use of 3D microstructure.

Bio

Carlos Portela is the Robert N. Noyce Career Development Associate Professor in Mechanical Engineering at MIT. Portela received his Ph.D. and M.S. in mechanical engineering from the California Institute of Technology, where he was given the Centennial Award for the best thesis in Mechanical and Civil Engineering. His research lies at the intersection of mechanics, nano-to-macro fabrication, and materials science with the objective of designing and testing novel materials--with features spanning from nanometers to centimeters--that yield unprecedented mechanical and acoustic properties. Portela is the recipient of the 2026 ONR YIP Award, a 2024 ARO Early Career Program Award, was recognized as an MIT TR Innovator Under 35 in 2022, and was a recipient of the 2022 NSF CAREER Award. His teaching efforts have been recognized by MIT's 2025 Jr. Bose Award and the 2023 Spira Award for Excellence in Teaching.