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The search for greater accuracy and precision in the measurement of dynamic properties of elastomeric components used in the automotive industry is a never-ending endeavor. This paper considers the statistical approach to designed experiments for evaluation of individual test machine repeatability and test machine differences. The approach is a discussion of the “Analysis of Variance” (ANOVA) technique and the mechanics of solution. The accuracy and precision variables are then applied to the technique for analysis. Included are the results of a precision error experiment conducted at General Tire and a round-robin test program, which was conducted through the joint ASTM-SAE Technical Committees on Automotive Rubber (TCAR Section 11.65B), both using the ANOVA statistical approach. The MTS 830 employing the transmitted force test method was used in the round-robin.
Nemec, J. E.
Group leader, The General Tire & Rubber Co., Akron, Ohio