Creep-assisted slow crack growth in bio-inspired dental multilayers

Jing Du, Xinrui Niu, Wole Soboyejo

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Ceramic crown structures under occlusal contact are often idealized as flat multilayered structures that are deformed under Hertzian contact loading. Previous models treated each layer as linear elastic materials and resulted in differences between the measured and predicted critical loads. This paper examines the combined effects of creep (in the adhesive and substrate layers) and creep-assisted slow crack growth (in the ceramic layer) on the contact-induced deformation of bio-inspired, functionally graded multilayer (FGM) structures and the conventional tri-layers. The time-dependent moduli of each of the layers were determined from constant load creep tests. The resulting modulus-time characteristics were modeled using Prony series. These were then incorporated into a finite element model for the computation of stress distributions in the sub-surface regions of the top ceramic layer, in which sub-surface radial cracks, are observed as the clinical failure mode. The time-dependent stresses are incorporated into a slow crack growth (SCG) model that is used to predict the critical loads of the dental multilayers under Hertzian contact loading. The predicted loading rate dependence of the critical loads is shown to be consistent with experimental results. The implications of the results are then discussed for the design of robust dental multilayers.

Original languageEnglish (US)
Pages (from-to)41-48
Number of pages8
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume46
DOIs
StatePublished - Jun 1 2015

Fingerprint

Ceramics
Crack propagation
Tooth
Multilayers
Creep
Growth
Crowns
Adhesives
Failure modes
Stress concentration
Cracks
Substrates

All Science Journal Classification (ASJC) codes

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

Cite this

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title = "Creep-assisted slow crack growth in bio-inspired dental multilayers",
abstract = "Ceramic crown structures under occlusal contact are often idealized as flat multilayered structures that are deformed under Hertzian contact loading. Previous models treated each layer as linear elastic materials and resulted in differences between the measured and predicted critical loads. This paper examines the combined effects of creep (in the adhesive and substrate layers) and creep-assisted slow crack growth (in the ceramic layer) on the contact-induced deformation of bio-inspired, functionally graded multilayer (FGM) structures and the conventional tri-layers. The time-dependent moduli of each of the layers were determined from constant load creep tests. The resulting modulus-time characteristics were modeled using Prony series. These were then incorporated into a finite element model for the computation of stress distributions in the sub-surface regions of the top ceramic layer, in which sub-surface radial cracks, are observed as the clinical failure mode. The time-dependent stresses are incorporated into a slow crack growth (SCG) model that is used to predict the critical loads of the dental multilayers under Hertzian contact loading. The predicted loading rate dependence of the critical loads is shown to be consistent with experimental results. The implications of the results are then discussed for the design of robust dental multilayers.",
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Creep-assisted slow crack growth in bio-inspired dental multilayers. / Du, Jing; Niu, Xinrui; Soboyejo, Wole.

In: Journal of the Mechanical Behavior of Biomedical Materials, Vol. 46, 01.06.2015, p. 41-48.

Research output: Contribution to journalArticle

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