Abstract
The fracture toughness of a sintered reaction‐bonded silicon nitride was measured by the single‐edge precracked beam and surface crack in flexure methods, which are two of the three complementary test methods in ASTM C 1421. Results were compared with chevron‐notched beam results that were available from another source. Precracks ranged from tiny artificial flaws introduced by Knoop indentation to millimeter‐long precracks in single‐edge precracked beams. The fracture toughness values from the three methods were in good agreement at 5.6 MPa·m1/2.
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