Crack tip stress field analysis of crack surface contact and opening during in situ wedge loading of human enamel

Enrico Salvati, Cyril Besnard, Robert A. Harper, Thomas Moxham, Richard Shelton, Gabriel Landini, Alexander M. Korsunsky

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Shallow cracks are often observed in dental enamel, however do not normally lead to deep fractures. Previous work has highlighted the toughening mechanisms that operate in enamel during crack propagation, but very little is known about the deformation and stress fields arising around the propagating cracks during realistic loading conditions. This work aims to elucidate how the stresses are distributed within human dental enamel when a preexisting crack is subjected to opening and surface contact with in situ indentation. We present a synchrotron-based in situ analysis coupled with a linear elastic finite element method simulation. The experimental reconstructed stress fields identified a prominent residual stress within the enamel, accompanied by a visible pattern that appeared clearly associated with its underlying microstructure. The numerical modelling of the stress field and discerning of surface contact and crack opening caused by the indentation was subsequently possible, even if in this study the influence of the anisotropy induced by the presence of features at a smaller scale was neglected. The implications of these findings and directions for future research are discussed.

Original languageEnglish
Title of host publicationAdvances in Fracture and Damage Mechanics XVIII
EditorsS.A. Paipetis, Ferri M.H. Aliabadi
PublisherTrans Tech Publications Ltd
Pages85-91
Number of pages7
ISBN (Print)9783035715866
DOIs
Publication statusPublished - 2020
Externally publishedYes
Event18th International Conference on Fracture and Damage Mechanics, FDM 2019 - Rhodes, Greece
Duration: 16 Sep 201918 Sep 2019

Publication series

NameKey Engineering Materials
Volume827 KEM
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Conference

Conference18th International Conference on Fracture and Damage Mechanics, FDM 2019
Country/TerritoryGreece
CityRhodes
Period16/09/1918/09/19

Keywords

  • Enamel
  • Fracture
  • In situ
  • Stress Analysis
  • Synchrotron
  • XRD

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