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Determination of Short‐Crack Toughness Curves
Author(s) -
Smith Stanley M.,
Scattergood Ronald O.
Publication year - 1996
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.1151-2916.1996.tb07890.x
Subject(s) - materials science , indentation , fracture toughness , composite material , toughness , calibration , crystallite , residual stress , ceramic , metallurgy , mathematics , statistics
Measurements of indentation crack length vs applied bend stress were used to develop a new method of analysis for determining short‐crack toughness curves. Three glass‐ceramics and a polycrystalline alumina were used as prototype test materials. Crack‐shape effects were incorporated into the analysis. The magnitude of the residual‐stress factor can be determined independently from the experimental data using the methodology. In contrast to other test methods using indentation precracks, calibration constants or reference materials are not required for obtaining absolute values of the toughness. Good agreement with conventional toughness values reported for the long‐crack limit was obtained for the different materials tested.