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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. 
Klocke, Arndt 
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.
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) CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
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