AUTHOR=Provis John L. TITLE=Grand Challenges in Structural Materials JOURNAL=Frontiers in Materials VOLUME=Volume 2 - 2015 YEAR=2015 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2015.00031 DOI=10.3389/fmats.2015.00031 ISSN=2296-8016