Statistical Analysis of Tensile Strength and Flexural Strength Data from Universal Testing Machine |

The most significant mechanical properties are tensile strength and flexural strength, since they have the benefit of maximum tensile stress and flexural stress. The purpose of this research is to evaluate the tensile strength and flexural strength data obtained from a universal testing machine statistically. The experiments were performed on a thermoplastic, specifically high-density polyethylene (HDPE), which, using an injection molding machine, was in-house molded. The tensile and flexural experiments were conducted by three distinct individuals. In these experiments, three other laboratories were also involved. To express the accuracy and repeatability of the experiments, the relative standard deviation (RSD) values were measured. Later, to help the comparison of the data, the standard score (z-score) values were also determined. Finally, the Single-Factor Analysis of Variance (ANOVA) was used to examine statistically significant differences between individual and laboratory tensile strength and flexural strength results. The RSD values of all three individuals and laboratories were lower than 5 percent from the estimate, suggesting that the data are consistent. The z-score values were within the range of -2 to 2 for all three individuals, indicating that the data was close to average. The z-score value for one of the three laboratories, however, was not within the range, suggesting that the information was unusual. The P-values of all three individuals were greater than 0.05 (with the exception of the flexural strength), which meant that the discrepancy between the mean data was not statistically important. Nevertheless, the P-values were smaller than 0.05 for all three laboratories, suggesting that the discrepancy between the mean data was statistically important.

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