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Split-Block Split-Plot Experimental Design to Assess Corrosion in Medium Carbon Steel

Summary: [This abstract is based on the authors' abstract.] This article examines the corrosion of medium carbon steel (MCS) with respect to three factors: cooling temperature, hydrochloric acid (HCl) concentration, and holding temperature. The factor levels consist of a 2³ factorial arrangement along with six center runs. The response is the weight loss of MCS for each of the fourteen specimens. Specimens are grouped together in a furnace for cooling temperature and in an oven for holding temperature according to a split-block design. Specimens are also assigned to HCl concentration according to a split-plot design with respect to the other two factors. This case study shows how to incorporate this design structure into the analysis of variance in order to determine important effects and optimal settings of the factor levels. Recommendations are also given for obtaining suitable replication and for fitting second-order models with respect to this design.

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  • Topics: Engineering
  • Keywords: Split-plot design, Design of experiments (DOE), Analysis of variance (ANOVA), Replication, Metals, Temperature, Degradation, Second-order designs
  • Author: Baniani, Ali Mohammad; Ramzanpour Nargesi, Zahra; Mokhtari Moghadam, Ali; Wulff, Shaun Sterling
  • Journal: Quality Engineering