AUTHOR=Hunt Giles , Groh Rainer , Dodwell Tim , Bertoldi Katia TITLE=Editorial: Nonlinear Structured Materials JOURNAL=Frontiers in Materials VOLUME=8 YEAR=2021 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2021.666990 DOI=10.3389/fmats.2021.666990 ISSN=2296-8016