Fracture toughness testing of biomedical ceramic-based materials using beams, plates and discs

The testing of fracture toughness becomes problematic when only limited amount of material is available that hinders the production of typical beam specimens to be tested in bending. Here we explore fracture toughness testing methodologies that allow for small discs and plates having surface cracks...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 38; no. 16; pp. 5533 - 5544
Main Authors Belli, Renan, Wendler, Michael, Petschelt, Anselm, Lube, Tanja, Lohbauer, Ulrich
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2018
Subjects
Ceramics
Composites
Dental
Fracture toughness
Testing
Composites
Ceramics
Dental
Fracture toughness
Testing
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Summary:The testing of fracture toughness becomes problematic when only limited amount of material is available that hinders the production of typical beam specimens to be tested in bending. Here we explore fracture toughness testing methodologies that allow for small discs and plates having surface cracks to be tested in biaxial flexure using the Ball-on-3-balls (B3B) set-up, or sawed notches as in the Compact Tension geometry. The B3B-KIc test has shown to be versatile and account for a very small overestimation of the KIc-value in the order of 0.8–1.25% due to in-plane crack mispositioning, and a maximum of 4% if a worst-case scenario of additional out-of-plane mispositioning is assumed. The geometrical factor in the standard SCF method, derived by Newman and Raju, resulted in an overestimation of ∼8% of the KIc-value compared to the new calculation by Strobl et al. for materials with Poisson’s ratio <0.3.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2018.08.012