Abstract
In order to evaluate fracture toughness of thin plates of aluminum nitrides and silicon nitrides, a small, thin single edge notched plate with the thickness of 0.32 or 0.64 mm was glued on one side of a brass beam and the assembly was deformed in three-point bending to introduce the precrack. The flexural strength of the precracked specimen was measured using a special 3pt-bending fixture. The resultant fracture toughness was almost identical to those obtained for the standard-sized specimens.
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