abstract_textpRound-robin exercises on three- and four-point flexural tests were successfully conducted to evaluate the fracture strength of Si3N4, Al2O3, and AlN thin plates for power modules. A 0.64 mm x 12 mm x 40 mm test specimen was loaded in three-point flexure with a major span of 30 mm or was loaded in four-point flexure with a major/minor span of 30/10 mm. For a 0.32 mm x 12 mm x 20 mm test specimen, both major and minor spans were halved. All test specimens were loaded in a fully articulated fixture provided by the test organizer. Reasonable consistencies in the resultant flexural strength were obtained between laboratories, indicating our new test condition for three- and four-point bending of thin ceramic plates is satisfactory for reliable measurement of the flexural strength./p/abstract_text
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