Abstract
Round-robin tests on the modified single edge-precracked plate method were conducted successfully to determine the fracture toughness of Si3N4, AlN and Al2O3 thin plates. A small, thin single edge notched plate with the thickness of 0.32 or 0.64mm was bonded on one side of a brass beam and the assembly was loaded in a three-point fixture to introduce the precrack. A special 3pt-bending fixture with a vertical slit was employed for the strength test. Good matches in the resultant fracture toughness were obtained between laboratories regardless of the thickness of ceramic plate, confirming the reliability of the new method.
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