Berlin 2015 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 37: Biomaterials and Biological Materials II
MM 37.4: Topical Talk
Wednesday, March 18, 2015, 12:30–13:00, TC 006
Architectured strength: when tasty nuts and teeth meet: — •Claudia Fleck1, Paul Zaslansky2, Wolf-Dieter Müller3, Andreas Bührig-Polaczek4, and Thomas Speck5 — 1Materials Engineering, Institute of Technology, Berlin, Germany — 2Julius-Wolff-Institute, Charité, Berlin, Germany — 3Biomaterials Research and Dental Materials Science, Charité, Berlin, Germany — 4Foundry Institute, RWTH, Aachen, Germany — 5Plant Biomechanics, University Freiburg, Freiburg, Germany
In nature, damage tolerant tissues or organs ensure survival, by failing safely. Failure of the whole structure is delayed to allow repair processes, or it is even stopped, leaving behind a locally damaged, but still functioning entity. Many damage tolerant structures exist, even without self-healing capacity, and often the border between material and architecture is blurred. Mammalian teeth and Macadamia nutshells are two impressive examples. Chewing loads on whole teeth are distributed and transferred into the jaw bone by an intricate architecture of hard and soft materials, preventing failure even over millions of loading cycles. Macadamia nutshells protect the seed, despite numerous inner notches, by a multi-level sandwich and foam structure paired with a ball-like macro-geometry. We apply mechanical testing, in situ with light/electron microscopy or lab/synchrotron microtomogrpahy, together with FE-calculations, to characterize the structural reasons of failure resistance, and we aim at developing architectured metal or ceramic constructs with enhanced damage tolerance as compared to the monolithic materials.