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Valid K IC Determination via In‐Test Subcritical Precracking of Chevron‐Notched Bend Bars

1989; Wiley; Volume: 72; Issue: 6 Linguagem: Inglês

10.1111/j.1151-2916.1989.tb06264.x

1551-2916

Jason Sung, Patrick S. Nicholson,

Advanced Surface Polishing Techniques

The initiation of the crack in a chevronnotched bend bar was studied. Ideal testing conditions depend strongly on specimen preparation and material; valid K IC values do not always result. An in‐test precracking technique was developed for ceramics at room and elevated temperatures. A yttria‐partially‐stabilized zirconia ceramic was tested, and the results showed that ideal testing conditions were obtained, which guaranteed valid K IC determination.