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  4. Size-dependent elastic-inelastic behavior of enamel over millimeter and nanometer length scales
 
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Size-dependent elastic-inelastic behavior of enamel over millimeter and nanometer length scales

Citation Link: https://doi.org/10.15480/882.747
Publikationstyp
Journal Article
Date Issued
2010
Sprache
English
Author(s)
Ang, Siang Fung  
Bortel, Emely Lea  
Swain, Michael V.  
Klocke, Arndt  
Schneider, Gerold A.  
Institut
Keramische Hochleistungswerkstoffe M-9  
TORE-DOI
10.15480/882.747
TORE-URI
http://tubdok.tub.tuhh.de/handle/11420/749
Journal
Biomaterials  
Volume
31
Issue
10
Start Page
1955
End Page
1963
Citation
Biomaterials vol. 31.2010(7), pp.1955-1963
Publisher DOI
10.1016/j.biomaterials.2009.11.045
Scopus ID
2-s2.0-73249132188
Publisher
Elsevier
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.
Subjects
elastisch-inelastischer Übergang
Mechanische Eigenschaften
Eindruckversuch
Druckversuch
hierarchische Struktur
size-dependent
elastic-inelastic transition
enamel
mechanical properties
nanoindentation
DDC Class
620: Ingenieurwissenschaften
Lizenz
http://doku.b.tu-harburg.de/doku/lic_ohne_pod.php
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