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Amplifying Strength, Toughness, and Auxeticity via Wavy Sutural Tessellation in Plant Seedcoats
Author(s) -
Gao Chao,
Hasseldine Benjamin P. J.,
Li Ling,
Weaver James C.,
Li Yaning
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201800579
Subject(s) - waviness , tile , toughness , materials science , tessellation (computer graphics) , isotropy , parametric statistics , composite material , finite element method , structural engineering , geometry , optics , engineering , mathematics , physics , statistics
Protective armors are widespread in nature and often consist of periodic arrays of tile‐like building blocks that articulate with each other through undulating interfaces. To investigate the mechanical consequences of these wavy tessellations, especially in instances where the amplitude of the undulations is near the scale of the constituent tiles as is found in the seedcoats of many plant species, an approach that integrates parametric modeling and finite element simulations with direct mechanical testing on their 3D‐printed multi‐material structural analogues is presented. Results from these studies demonstrate that these tiled arrays of largely isotropic star‐like unit cells exhibit an unusual combination of mechanical properties including auxeticity and mutually amplified strength and toughness which can be systematically tuned by varying the waviness of the sutural tessellation.