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Damage modeling of small-scale experiments on dental enamel with hierarchical microstructure
Citation Link: https://doi.org/10.15480/882.2256
Publikationstyp
Journal Article
Date Issued
2015-12
Sprache
English
TORE-DOI
TORE-URI
Journal
Volume
15
Start Page
244
End Page
253
Citation
Acta biomaterialia (15): 244-253 (2015)
Publisher DOI
Scopus ID
Publisher
Elsevier
Dental enamel is a highly anisotropic and heterogeneous material, which exhibits an optimal reliability with respect to the various loads occurring over years. In this work, enamel's microstructure of parallel aligned rods of mineral fibers is modeled and mechanical properties are evaluated in terms of strength and toughness with the help of a multiscale modeling method. The established model is validated by comparing it with the stress-strain curves identified by microcantilever beam experiments extracted from these rods. Moreover, in order to gain further insight in the damage-tolerant behavior of enamel, the size of crystallites below which the structure becomes insensitive to flaws is studied by a microstructural finite element model. The assumption regarding the fiber strength is verified by a numerical study leading to accordance of fiber size and flaw tolerance size, and the debonding strength is estimated by optimizing the failure behavior of the microstructure on the hierarchical level above the individual fibers. Based on these well-grounded properties, the material behavior is predicted well by homogenization of a representative unit cell including damage, taking imperfections (like microcracks in the present case) into account.
Subjects
dental enamel
mechanical characterization
micromechanical modeling
hierarchical material
homogenization
DDC Class
500: Naturwissenschaften
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