PSI - Issue 14

Puneeth N et al. / Procedia Structural Integrity 14 (2019) 53–59 Structural Integrity Procedia 00 (2018) 000 – 000

56 4

Table 3: S/N for Hardness, Impact and Tensile strength

Sl No

Hardness (RHN)

S/N ratio

Tensile strength (N/mm2)

S/N ratio

Impact Energy (J)

S/N ratio

Fracture toughness (Mpa √mm)

S/N ratio

B1 B2 B3 B4 B5 B6 B7 B8 B9

77 80 85 88 95 90 93 81 96

37.72 38.06 38.58 38.88 39.55 38.08 39.36 38.16 39.64

144.47 162.86 165.26 170.16 190.32 194.96 183.03 172.64 176.07

43.1 44.2 44.3 44.6 45.5 45.7 45.2 44.7 44.9

7.6

17.6

49.28 60.26 72.31 61.17 83.76 59.84 61.51 49.84 60.91

33.85 35.60 37.18 35.73 38.46 35.54 35.78 33.95 35.69

8

18 20

10 17 14 12

24.6 22.9 21.5

8 9

18 19

14

22.9

3.1 Effect of wt. % of reinforcement, stir speed and stir time on Hardness The ANOVA results tabulated below for Hardness of the MMC’s shows the effect of each process parameter at each process level on the response. Table 4: Mean S/N ratio for Hardness 1. Level Wt. % Stir speed(rpm) Stir time(min) 1 38.13 38.66 38.33 2 39.18 38.60 38.87 3 39.06 39.11 39.17 Delta 1.05 0.51 0.84 Rank 1 3 2 3.2 Effect of wt. % of reinforcement on stir speed and stir time on tensile strength The ANOVA results tabulated below for the Tensile strength of the material shows the effect of each process parameter at each process level on the response Table 5: Mean S/N ratio for tensile strength Level Wt. % Stir speed(rpm) Stir time(min) 1 43.93 44.35 44.58 2 45.34 44.86 44.59 3 44.97 45.03 45.07 Delta 1.40 0.67 0.49 3.3 Effect of wt. % of reinforcement, stir speed and stir time on impact strength The ANOVA results tabulated below for impact strength of the material shows the effect of each process parameter at each process level on the response Table 6: Mean S/N ratio for impact strength Level Wt. % Stir speed(rpm) Stir time(min) 1 18.56 20.10 19.43 2 23.04 20.02 21.86 3 20.02 21.50 20.33 Delta 4.48 1.48 2.44 Rank 1 3 2 3.4 Effect of wt. % of reinforcement, stir speed and stir time on fracture toughness The ANOVA results tabulated below for fracture toughness of the material shows the effect of each parameter at each level on the response.