OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 2 2025 Table 4 shows the experimental matrix. The trials were conducted for all specimens at a constant sliding distance of 5 km, and 20 experiments were conducted for each specimen material. It is evident from the experimental matrix that experiments 15–20 represent repetitions of the center point. Researchers can assess Ta b l e 2 Levels of parameters for the experiments Parameters Normal load (N) Sliding Speed (rpm) Temperature (°C) Low level 15 400 60 High level 200 1,000 200 Track Distance 5 km Ta b l e 3 Alpha values and corresponding variable levels Alpha Value −1.682 −1 0 +1 +1.682 Normal load (N) 15 55 115 155 200 Sliding Speed (rpm) 400 521 700 878 1,000 Temperature (°C) 60 88 130 171 200 Ta b l e 4 Experimental matrix Run Normal load (N) Sliding speed (rpm) Temperature (°C) 1 55 521 88 2 155 521 88 3 55 878 88 4 155 878 88 5 55 521 172 6 155 521 172 7 55 878 172 8 155 878 172 9 15 700 130 10 200 700 130 11 115 400 130 12 115 1000 130 13 115 700 60 14 115 700 200 15 115 700 130 16 115 700 130 17 115 700 130 18 115 700 130 19 115 700 130 20 115 700 130
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