228
C. Rajkumar et al.
Table 6 ANOVA table
Source
DF
SS
MS
F
P
Contribution %
Load
1
9.193
9.1935
0.73
0.432
3.0
Material
1
54.677
54.6771
4.34
0.092
18.0
Condition
1
53.588
53.5877
4.25
0.094
17.6
Atmosphere
1
13.561
13.5608
1.08
0.347
4.5
Load * Material
1
9.35
9.3497
0.74
0.429
3.1
Load * Condition
1
0.366
0.3663
0.03
0.871
0.1
Load * Atmosphere
1
30.865
30.8648
2.45
0.179
10.2
Material * Condition
1
15.027
15.0271
1.19
0.325
4.9
Material * Atmosphere
1
12.628
12.6278
1
0.363
4.2
Condition * Atmosphere
1
41.682
41.6822
3.3
0.129
13.7
Residual error
5
63.062
12.6123
20.7
Total
15
303.999
100.0
30
20
30.5
30.0
29.5
29.0
28.5
28.0
27.5
27.0
26.5
DSS-B
DSS-A
Forged
Sintered
Partial-Vacuum
Hydrogen
Load
Mean of SN ratios
Material
Condition
Atmosphere
Main Effects Plot for SN ratios
Data Means
Signal-to-noise: Smaller is better
Fig. 1 Response graphs
4 Conclusions
1. Material has influenced 18% towards wear rate compared to other factors such
as condition and atmosphere.
2. The rank shows the material is the main cause influencing the wear rate of DSS.