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

DOI: 10.4028/www.scientific.net/KEM.827.85 DOI Help

Authors: Enrico Salvati (University of Oxford) , Cyril Besnard (University of Oxford) , Robert A. Harper (University of Birmingham) , Thomas Moxham (University of Oxford; Diamond Light Source) , Richard Shelton (University of Birmingham) , Gabriel Landini (University of Birmingham) , Alexander M. Korsunsky (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Key Engineering Materials , VOL 827 , PAGES 85 - 91

State: Published (Approved)
Published: December 2019
Diamond Proposal Number(s): 20540

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 pre-existing 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.

Journal Keywords: Enamel; Fracture; in situ; Synchrotron; Stress Analysis; XRD

Subject Areas: Materials, Engineering


Instruments: I12-JEEP: Joint Engineering, Environmental and Processing