Table 9.
Parameters and their levels.
| Parameters | Symbol | Level 1 | Level 2 | Level 3 |
|---|---|---|---|---|
| Load, (N) | L | 3 | 6 | 9 |
| Grit, (mesh) | G | 1000 | 400 | 150 |
| Sliding distance, (m) | SD | 25 | 45 | 55 |
| Sliding speed , (ms−1) | SS | 0.04 | 0.08 | 0.14 |
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