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Use of the Notched‐Beam Test for Evaluation of Fracture Energies of Ceramics
Author(s) -
SIMPSON L. A.
Publication year - 1974
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1974.tb10843.x
Subject(s) - materials science , ceramic , radius , beam (structure) , fracture (geology) , composite material , microstructure , volume (thermodynamics) , fracture mechanics , structural engineering , physics , thermodynamics , computer science , computer security , engineering
The mathematical analysis of the notched‐beam specimen for fracture‐energy determination considers a beam containing a zero‐volume crack, i.e. a crack with zero width. Such a configuration is difficult to reproduce in practice with ceramics, and artificially cut notches with widths large relative to the scale of the ceramic microstructure are usually used. Evidence is presented which suggests that incorrect results can be obtained using such notches even when real cracks exist at the notch root. The effects of notch width and depth are examined for Al 2 O 3 , graphite, and SiC. A tentative specification of a root‐crack‐notch‐radius relation is proposed for the application of this technique to ceramics.