A statistical experiment using two-way ANOVA with replication was performed to compare the differences between two testing methods and two sample preparation methods. A four-point bend method to test the properties of ceramic mold shells has been developed, and is analyzed in this experiment. This method provides a larger region of uniform stress for test sample failure when compared to a "modulus of rupture" value defined by three-point bend testing. The test specimen and fixture design followed the concepts of error reduction proposed by F.I. Baratta (Baratta, 1982). The four-point bend method that was developed is compared to standard modulus of rupture testing. Sample preparation that avoids the introduction of additional flaws in the structure while minimizing the stress exposure during sample preparation is also proposed and compared to standard sawn and sanded samples. The statistical analysis supported the validity of four-point bend testing, and the proposed new sample preparation method.
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