Journal
ADVANCED MATERIALS
Volume 30, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201800579
Keywords
3D printing; auxetic; finite element simulations; seedcoat; suture
Categories
Funding
- National Science Foundation (NSF) [1362893]
- U.S. Air Force Office of Scientific Research (AFOSR) [FA9550-16-1-0011]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1362893] Funding Source: National Science Foundation
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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.
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