Fracture Toughness of Toughened Silicon Nitride by ASTM C 1421
George D. Quinn, J Swab, M J. Motyka
The fracture toughness of a commercial sintered reaction-bonded silicon nitride was measured by the three complementary test methods in ASTM C 1421. Precracks ranged from tiny artificial flaws introduced by Knoop indentation to millimeter long precracks in single-edge precracked beams. Although this material probably has a rising R-curve, the fracture values from the three methods were in good agreement.
Journal of the American Ceramic Society
ASTM C 1421, chevron notch beam, fracture toughness, reference material, silicon nitride, silicon-edge precracked beam, surface crack in flexure