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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Biological Materials Science
Presentation Title Bioinspired Routes to Damage Tolerant Materials: Unique Microstructure and Fracture Properties of Enamel in the Mammal-like Grinding Dentition of a the Hadrosaurid Dinosaur
Author(s) Soumya Varma, Manish Jain, Yi Teng Lee, Shane Johnson, B. A. Krick, G. M. Erickson, Daniele Casari, Johann Michler, Jakob Schwiedrzik, Shraddha J. Vachhani, Sid Pathak
On-Site Speaker (Planned) Soumya Varma
Abstract Scope Unlike grazing mammals, hadrosaurid dinosaurs with grinding dentitions evolved an aprismatic undulating wavy enamel structure (folded layers of parallel hydroxyapatite crystallites separated by thin layers of loosely aggregated inter-layer matrix), among most complex enamel known in reptilian taxon. We test the hypothesis that these structures served same function as prismatic enamels (columns of hydroxyapatite crystals surrounded by proteinaceous sheaths set within a loosely aggregated hydroxyapatite matrix) of current grazing mammals through comparative fracture experimentation. We utilized small scale testing such as high throughput nanoindentation, specialized FIB-fabricated micro-pillar compression and micro-tensile loading. These mechanical datasets were correlated with the structural information at complementary length scales using optical profilometry and BSE-SEM. The structure-property maps reflect the unique morphology of the wavy enamel layering, where the periodic variations in properties between the layers, combined with the enamel layer undulations, is postulated to promote remarkable fracture resistance, damage localization and strategically controlled crack directionality.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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