Issue 68

P. Kulkarni et alii, Frattura ed Integrità Strutturale, 68 (2024) 222-241; DOI: 10.3221/IGF-ESIS.68.15

Run No. V (m/min)

f (mm/rev)

d (mm)

F c (N) 62.905 66.224 66.401 67.086 62.141 69.234 91.739 64.167

F f (N) 19.393 21.650 21.774 22.258 18.892 23.812 33.944 20.236

F r (N) 9.693 11.216 11.301 11.635 12.723 17.771 10.255 9.362

R a (µm)

T (min)

1 2 3 4 5 6 7 8

84.644 56.917 55.763 51.519 93.017 40.395 30.536 72.616

0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1

0.202 0.202 0.202 0.202 0.202 0.202 0.251 0.202

0.612 0.716 0.722 0.745 0.590 0.820 0.963 0.650

8.491

15.249 15.717 17.664

7.388

25.290 33.477

10.645 Table 6: Genetic algorithm: Pareto efficient solutions for hybrid Al 2 O 3 +MWCNT nanofluid.

Separation measures

Closeness coefficient

Normalized results for

Normalized weighted matrix for

Rank

Run no.

F c

F f

F r

R a

T

F c

F f

F r

R a

T

S

S -

CC

+

i

1 2 3 4 5 6 7 8 9

15.3 4.7 1.7 0.11 22.5 8.0 3.4 0.24 17.4 5.7 2.3 0.17 22.5 8.0 3.4 0.24 17.4 5.7 2.3 0.17 15.3 4.7 1.7 0.11 17.4 5.7 2.3 0.17 17.4 5.7 2.3 0.17 17.4 5.7 2.3 0.17 29.3 11. 3 4.9 0.32

0.54 6.90 2.67 6.90 14.2 2.68 0.54 2.67 2.68 2.68

0.53 0.78 0.60 0.78 1.01 0.60 0.53 0.60 0.60 0.60

0.29 0.50 0.36 0.50 0.71 0.36 0.29 0.36 0.36 0.36

0.15 0.29 0.20 0.29 0.43 0.20 0.15 0.20 0.20 0.20

0.009 0.019 0.014 0.019 0.025 0.014 0.009 0.014 0.014 0.014

0.402 10.077 0.699

0.935 0.535 0.835 0.535 0.065 0.835 0.935 0.835 0.835 0.835

2 9 3 8 7 1 4 5 6

5.091 1.976 5.091 10.47 1.976 1.976 1.976 1.976

5.399 8.504 5.399 0.699 8.504 8.504 8.504 8.504

4.702 1.681 4.702 10.07 1.681 1.681 1.681 1.681

10

0.402 10.077 0.699

10

Table 7: GA-TOPSIS ideal solutions ranking for unitary Al 2 O 3 nanofluid.

The process parameters for optimum solutions can be referred to in Tabs. 5 and 6 for unitary and hybrid nanofluids, respectively. It has been seen that the cutting speed of 93 m/min, feed of 0.1 mm, and depth of cut of 0.2 mm are the ideal parameters for both nanofluids. With these parameters, the tangential cutting force of 79.19 and 62.141 N, feed force of 23.71 and 18.892 N, radial force of 9.374 and 9.362 N, surface roughness of 0.648 and 0.59 µm, and tool life of 6.59 and 7.388 minutes could be obtained during turning Inconel 718 alloy using unitary Al 2 O 3 and hybrid Al 2 O 3 +MWCNT nanofluids under MQL conditions. However, to verify the accuracy of the findings, validation experiments must be conducted.

Separation measures

Closeness coefficient

Normalized results for

Normalized weighted matrix for

Rank

Run no.

F c

F f

F r

R a

T

F c

F f

F r

R a

T

S

S -

CC

+

i

1 2 3 4 5 6 7 8

13.5 3.8 1.8 0.12 15.0 4.8 2.5 0.16 15.1 4.9 2.5 0.17 15.4 5.1 2.7 0.18 13.2 3.6 1.7 0.11 16.4 5.8 3.2 0.21

0.95 3.07 3.26 4.12 0.72 8.46 14.8 1.50

0.54 0.60 0.61 0.62 0.53 0.66 1.16 0.56

0.36 0.45 0.45 0.47 0.34 0.54 1.11 0.39

0.21 0.28 0.28 0.30 0.19 0.36 0.70 0.23

0.008 0.011 0.011 0.012 0.008 0.015 0.020 0.009

0.657 2.120 2.252 2.844 0.498 5.831 10.21 1.033

9.559 8.098 7.966 7.375 9.719 4.395 1.117 9.184

1.102 1.886 1.998 2.523 1.117 5.397 9.719 1.173

0.897 0.811 0.800 0.745 0.897 0.449 0.103 0.887

2 4 5 6 1 7 8 3

28.9 11. 9

6.3 0.30

14.1 4.2 2.1 0.13

Table 8: GA-TOPSIS ideal solutions ranking for hybrid Al 2 O 3 +MWCNT nanofluid.

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