## 3 Results
### Statistical Analysis  
To complement the experimental analysis, a detailed statistical analysis was also performed, the results of which are presented in Tables 7-10, as well as in Figure 16.  
Analyzing the results obtained from the statistical calculation, it is evident that the variability in roughness increases with the load. This is substantiated by the fact that a higher load leads to more pronounced and uneven surface wear. The variability in the maximum height of irregularities (Rt and Rz) is greater than the variability in the average value of the irregularities (Ra). This suggests that the maximum height of irregularities is more susceptible to variations in testing conditions. The standard deviation values are relatively small, indicating good measurement precision. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Load (N)**} & \multirow{2}{*}{\
\begin{tabular}{c} **Rotation** \\ **Speed (rpm)** \\ \end{tabular} } & \multirow{2}{*}{
\begin{tabular}{c} **Number of** \\ **Cycles** \\ \end{tabular} } & \multicolumn{2}{c}{**Wear of Pucest Panel Sample**} & \multicolumn{2}{c}{**Wear of Hardox 400 Steel**} & \multicolumn{2}{c}{**Wear of the Metal Sample**} \\ \cline{5-10}  & & & \multicolumn{2}{c}{**(\(\upmu\)m)**} & \multicolumn{2}{c}{**Sample (\(\upmu\)m)**} & \multicolumn{2}{c}{**(\(\upmu\)m)**} \\ \cline{5-10}  & & & **Ra** & **Rt** & **Ra** & **Rt** & **Ra** & **Rt** \\ \hline \multirow{5}{*}{0} & \multirow{5}{*}{200} & initial & 4.2 & 39.5 & 1.1 & 12 & 0.5 & 7.5 \\  & & 500 & 3.2 & 22.5 & 1.2 & 13 & 0.6 & 8 \\  & & 1000 & 3 & 22.5 & 1.5 & 14.5 & 0.6 & 8 \\  & & 1500 & 2.2 & 19.5 & 1.2 & 15.5 & 0.7 & 12 \\  & & 2000 & 2.3 & 18.5 & 1.5 & 16 & 1 & 14.5 \\ \cline{2-10}  & & \multirow{5}{*}{400} & initial & 0.4 & 4.0 & 0.7 & 7 & 0.7 & 7 \\  & & 500 & 0.4 & 4.5 & 0.7 & 7 & 0.7 & 10.5 \\  & & 1000 & 0.5 & 5.0 & 0.7 & 7 & 1 & 9.5 \\  & & 1500 & 0.6 & 8.0 & 0.8 & 11 & 0.9 & 11.5 \\  & & 2000 & 0.5 & 4.5 & 0.9 & 12 & 1.2 & 15 \\ \hline \multirow{5}{*}{2} & \multirow{5}{*}{200} & initial & 0.4 & 5 & 1 & 12 & 0.7 & 7.5 \\  & & 500 & 0.5 & 5 & 2.3 & 19.5 & 0.9 & 9 \\  & & 1000 & 0.5 & 6 & 2.2 & 20.5 & 0.9 & 9 \\  & & 1500 & 0.6 & 6.5 & 2.3 & 22 & 1 & 9.5 \\  & & 2000 & 0.5 & 5.5 & 2.4 & 22.5 & 1 & 12 \\ \cline{2-10}  & & \multirow{5}{*}{400} & initial & 1.7 & 15 & 0.9 & 8.5 & 0.9 & 12.5 \\  & & 500 & 2.2 & 17 & 1.5 & 19.5 & 1.4 & 17 \\  & & 1000 & 2.5 & 20.5 & 1.8 & 24 & 1.5 & 18 \\  & & 1500 & 5.3 & 57 & 1.7 & 25 & 1.2 & 19 \\  & & 2000 & 1.1 & 7.5 & 1.7 & 28.5 & 1.8 & 22.5 \\ \hline \multirow{5}{*}{5} & \multirow{5}{*}{200} & initial & 0.4 & 4.5 & 0.6 & 6 & 0.8 & 6.5 \\  & & 500 & 0.4 & 4.0 & 0.6 & 6 & 0.9 & 11.5 \\  & & 1000 & 0.4 & 7.0 & 0.6 & 6.5 & 1 & 12 \\  & & 1500 & 0.7 & 10.5 & 0.6 & 7 & 1 & 15 \\  & & 2000 & 0.8 & 14.5 & 0.8 & 7 & 1.2 & 14.5 \\ \cline{2-10}  & & \multirow{5}{*}{400} & initial & 0.6 & 16 & 0.4 & 7 & 0.8 & 7.5 \\  & & 500 & 0.9 & 13 & 0.6 & 13.5 & 1.2 & 15.5 \\ \cline{2-10}  & & 1000 & 0.4 & 4.5 & 0.7 & 14.5 & 1.2 & 16.5 \\ \cline{2-10}  & & 1500 & 0.5 & 7.5 & 0.9 & 17 & 1.4 & 15 \\ \cline{2-10}  & & 2000 & 0.5 & 7.5 & 0.9 & 17.5 & 1.5 & 14.5 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Tribological Test Results: Pucest Panel, Hardox 400 Steel, and Metal Sheet.