|Publisher DOI:||10.1016/j.biomaterials.2009.11.045||Title:||Size-dependent elastic-inelastic behavior of enamel over millimeter and nanometer length scales||Language:||English||Authors:||Ang, Siang Fung
Bortel, Emely Lea
Swain, Michael V.
Schneider, Gerold A.
|Keywords:||elastisch-inelastischer Übergang;Mechanische Eigenschaften;Eindruckversuch;Druckversuch;hierarchische Struktur;size-dependent;elastic-inelastic transition;enamel;mechanical properties;nanoindentation||Issue Date:||2010||Publisher:||Elsevier||Source:||Biomaterials vol. 31.2010(7), pp.1955-1963||Journal or Series Name:||Biomaterials||Abstract (english):||The microstructure of enamel like most biological tissues has a hierarchical structure which determines their mechanical behavior. However, current studies of the mechanical behavior of enamel lack a systematic investigation of these hierarchical length scales. In this study, we performed macroscopic uni-axial compression tests and the spherical indentation with different indenter radii to probe enamel’s elastic/inelastic transition over four hierarchical length scales, namely: ‘bulk enamel’ (mm), ‘multiple-rod’ (10’s µm), intra-rod’ (100’s nm with multiple crystallites) and finally ‘single-crystallite’ (10’s nm with an area of approximately one hydroxyapatite crystallite). The enamel’s elastic/inelastic transitions were observed at 0.4-17GPa depending on the length scale and were compared with the values of synthetic hydroxyapatite crystallites. The elastic limit of a material is important as it provides insights into the deformability of the material before fracture. At the smallest investigated length scale (contact radius ~20nm), elastic limit is followed by plastic deformation. At the largest investigated length scale (contact size ~1mm), only elastic then micro-crack induced response was observed. A map of elastic/inelastic regions of enamel from millimeter to nanometer length scale is presented. Possible underlying mechanisms are also discussed.||URI:||http://tubdok.tub.tuhh.de/handle/11420/749||DOI:||10.15480/882.747||ISSN:||0142-9612||Institute:||Keramische Hochleistungswerkstoffe M-9||Type:||(wissenschaftlicher) Artikel||License:||CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)|
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