Ultrahigh Specific Strength by Bayesian Optimization of Carbon Nanolattices
Abstract
AbstractNanoarchitected materials are at the frontier of metamaterial design and have set the benchmark for mechanical performance in several contemporary applications. However, traditional nanoarchitected designs with conventional topologies exhibit poor stress distributions and induce premature nodal failure. Here, using multi‐objective Bayesian optimization and two‐photon polymerization, optimized carbon nanolattices with an exceptional specific strength of 2.03 MPa m3 kg−1 at low densities <215 kg m−3 are created. Generative design optimization provides experimental improvements in strength and Young's modulus by as much as 118% and 68%, respectively, at equivalent densities with entirely different lattice failure responses. Additionally, the reduction of nanolattice strut diameters to 300 nm produces a unique high‐strength carbon with a pyrolysis‐induced atomic gradient of 94% sp2 aromatic carbon and low oxygen impurities. Using multi‐focus multi‐photon polymerization, a millimeter‐scalable metamaterial consisting of 18.75 million lattice cells with nanometer dimensions is demonstrated. Combining Bayesian optimized designs and nanoarchitected pyrolyzed carbon, the optimal nanostructures exhibit the strength of carbon steel at the density of Styrofoam offering unparalleled capabilities in light‐weighting, fuel reduction, and contemporary design applications.
Article Details
Authors (20)
Peter Serles
Department of Mechanical and Industrial Engineering University of Toronto Toronto ON M5S 3G8 Canada
Jinwook Yeo
Michel Haché
Department of Materials Science and Engineering University of Toronto 184 College St Toronto M5S 3E4 Canada
Pedro Guerra Demingos
Department of Materials Science and Engineering University of Toronto 184 College St Toronto M5S 3E4 Canada
Jonathan Kong
Department of Materials Science and Engineering University of Toronto 184 College St Toronto M5S 3E4 Canada
Pascal Kiefer
Institute of Applied Physics Karlsruhe Institute of Technology Kaiserstraße 12 76131 Karlsruhe Germany
Somayajulu Dhulipala
Department of Mechanical Engineering Massachusetts Institute of Technology 77 Massachusetts Ave. Cambridge 02139 USA
Boran Kumral
Katherine Jia
Department of Mechanical & Industrial Engineering University of Toronto 5 King's College Road Toronto M5S 3G8 Canada
Shuo Yang
Department of Polymer Science & Engineering, State Key Laboratory of Analytical Chemistry for Life Science, MOE Key Laboratory of High Performance Polymer Materials and Technology, School of Chemistry
Tianjie Feng
Department of Chemical Engineering & Applied Chemistry University of Toronto 200 College St Toronto M5S 3E5 Canada
Charles Jia
Department of Chemical Engineering & Applied Chemistry University of Toronto 200 College St Toronto M5S 3E5 Canada
Pulickel M. Ajayan
Carlos M. Portela
Department of Mechanical Engineering, Massachusetts Institute of Technology
Martin Wegener
Jane Howe
Department of Materials Science and Engineering University of Toronto 184 College St Toronto M5S 3E4 Canada
Chandra Veer Singh
Department of Materials Science and Engineering
Yu Zou
Seunghwa Ryu
Tobin Filleter