Table 4: Response table for signal-to-noise Ratios—smaller is better (wear rate).

LevelA-Fly ash content
(wt.%)
B-Applied load
(N)
C-Sliding speed
(m/s)

1−39.15−36.01−37.87
2−37.39−37.31−37.46
3−35.76−38.99−36.98
Delta3.392.990.89
Rank123