Exp. No | Experimental data | Normalized data | Value of ∆ | Grey relational coefficients | Grey relational grade | ||||
COF | Wear rate (mm3/m) | Norm. COF | Norm. WR | ∆Value COF | ∆Value WR | ξ value COF | ξ value WR | ||
1 | 0.5382 | 0.00469 | 0.3292 | 0.2166 | 0.6708 | 0.7834 | 0.427 | 0.3893 | 0.40821 |
2 | 0.4417 | 0.0044 | 0.6103 | 0.3221 | 0.3897 | 0.6779 | 0.5691 | 0.4245 | 0.4932 |
3 | 0.3355 | 0.00481 | 0.9194 | 0.1729 | 0.0858 | 0.8271 | 0.8612 | 0.3768 | 0.619 |
4 | 0.5802 | 0.00414 | 0.2067 | 0.4153 | 0.7932 | 0.5846 | 0.3866 | 0.46106 | 0.4238 |
5 | 0.4989 | 0.00466 | 0.4436 | 0.2256 | 0.5563 | 0.7743 | 0.4733 | 0.3924 | 0.4328 |
6 | 0.4761 | 0.00381 | 0.51 | 0.5347 | 0.4899 | 0.4653 | 0.5051 | 0.518 | 0.51157 |
7 | 0.5963 | 0.00528 | 0.1599 | 0 | 0.8401 | 1 | 0.3731 | 0.3333 | 0.3532 |
8 | 0.5633 | 0.00446 | 0.2561 | 0.3004 | 0.7438 | 0.6996 | 0.40199 | 0.4168 | 0.4094 |
9 | 0.5128 | 0.00379 | 0.4032 | 0.5433 | 0.5968 | 0.4566 | 0.456 | 0.5227 | 0.4893 |
10 | 0.6512 | 0.00442 | 0 | 0.3133 | 1 | 0.6867 | 0.3333 | 0.4219 | 0.3776 |
11 | 0.4965 | 0.00385 | 0.4506 | 0.5206 | 0.5493 | 0.4793 | 0.4764 | 0.5112 | 0.4938 |
12 | 0.4032 | 0.0046 | 0.7224 | 0.24644 | 0.2775 | 0.7535 | 0.643 | 0.3989 | 0.5209 |
13 | 0.4617 | 0.00483 | 0.552 | 0.1662 | 0.4479 | 0.8337 | 0.5274 | 0.374 | 0.4507 |
14 | 0.3842 | 0.00421 | 0.7775 | 0.3896 | 0.2224 | 0.6104 | 0.6921 | 0.4503 | 0.5712 |
15 | 0.3078 | 0.00369 | 1 | 0.5764 | 0 | 0.4236 | 1 | 0.5414 | 0.7707 |
16 | 0.5823 | 0.00395 | 0.2005 | 0.4842 | 0.7994 | 0.5157 | 0.3847 | 0.4923 | 0.4385 |
17 | 0.5069 | 0.00268 | 0.4203 | 0.9451 | 0.57967 | 0.0548 | 0.4631 | 0.40135 | 0.6822 |
18 | 0.4803 | 0.00339 | 0.4978 | 0.6856 | 0.50218 | 0.3143 | 0.4989 | 0.614 | 0.5564 |
19 | 0.4913 | 0.00378 | 0.4657 | 0.5467 | 0.5342 | 0.4532 | 0.4834 | 0.5245 | 0.5039 |
20 | 0.4284 | 0.00324 | 0.6489 | 0.7396 | 0.3511 | 0.26039 | 0.5832 | 0.6576 | 0.6225 |
21 | 0.3685 | 0.00253 | 0.8234 | 0.9999 | 0.1766 | 0.000069 | 0.7389 | 1 | 0.8694 |
22 | 0.4922 | 0.00402 | 0.463 | 0.4599 | 0.5368 | 0.5401 | 0.4822 | 0.4808 | 0.4815 |
23 | 0.4465 | 0.00426 | 0.5962 | 0.3726 | 0.4038 | 0.6274 | 0.5532 | 0.4435 | 0.4984 |
24 | 0.3825 | 0.00378 | 0.7827 | 0.544 | 0.2179 | 0.4559 | 0.697 | 0.5231 | 0.6101 |
25 | 0.50061 | 0.0044 | 0.4386 | 0.3204 | 0.5613 | 0.6793 | 0.4711 | 0.4239 | 0.4475 |
26 | 0.4787 | 0.00404 | 0.50246 | 0.4498 | 0.4975 | 0.5502 | 0.5012 | 0.4761 | 0.4887 |
27 | 0.4635 | 0.00421 | 0.5468 | 0.3883 | 0.4532 | 0.6117 | 0.5245 | 0.4449 | 0.48716 |