Regensburg 2007 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 35: SYBM Bioinspired Materials
MM 35.28: Poster
Donnerstag, 29. März 2007, 18:45–20:45, H16
Fibrillar level deformation mechanisms in antler — •Stefanie Krauss1, Himadri Shikhar Gupta1, Jong Seto1, John Currey2, Tomas Landete-Castillejos3, Sergio Souza Funari4, Stephan Volkher Roth4, and Peter Fratzl1 — 1Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany — 2Department of Biology, University of York, York, United Kingdom — 3IREC (Sec. Albacete) y ETSI Agronomos, IDR, Univ. Castilla-La Mancha, Albacete, Spain — 4HASYLAB-DESY, Hamburg, Germany
In bone and related biomineralized tissues, the combination of a ductile organic matrix (mostly Type I collagen) with stiff mineral crystallites leads to a material with high stiffness and excellent resistance to fracture. As recently shown by us, the mechanisms leading to this in bone involve shearing in the interfibrillar matrix as well as cooperative deformation between mineral and collagen within the fibril. Deer antler is a less mineralized bone type that shows an extremely high toughness, which has obvious advantages for its physiological function as a weapon during dominance fights between male deer in the rutting period. Using in-situ mechanical testing with time-resolved synchrotron X-ray measurements of the meridional collagen small-angle diffraction pattern, we measured the changes in fibril strain while simultaneously stretching the tissue to failure. We compare the fibril and tissue strain and the variation of the 3rd order meridional collagen peak shape with increasing stress. We discuss how these structural changes at the nanoscale may influence the macroscopic toughness of antler.