Open Access
Table 6
ANOVA for response surface quadratic model − normal stress.
| Sources | DF | Sum of square | Mean square | F-values | p-values |
|---|---|---|---|---|---|
| Model | 9 | 149518 | 16613.2 | 761.26 | 0.000 |
| Linear | 3 | 6162 | 2054.0 | 94.12 | 0.000 |
| Plate thickness | 1 | 1534 | 1534.4 | 70.31 | 0.000 |
| Root gap | 1 | 2865 | 2864.5 | 131.26 | 0.000 |
| Load | 1 | 9 | 8.9 | 0.41 | 0.537 |
| Square | 3 | 3184 | 1061.3 | 48.63 | 0.000 |
| Plate thickness × plate thickness | 1 | 2842 | 2842.5 | 130.25 | 0.000 |
| Root gap × root gap | 1 | 11 | 11 | 0.52 | 0.489 |
| Load × load | 1 | 0 | 0 | 0.00 | 0.967 |
| 2-way interaction | 3 | 2420 | 806.7 | 36.97 | 0.000 |
| Plate thickness × root gap | 1 | 2396 | 2396.0 | 109.79 | 0.358 |
| Plate thickness × load | 1 | 20 | 20.2 | 0.93 | 0.728 |
| Root gap × load | 1 | 0 | 2.8 | 0.13 | |
| Error | 10 | 218 | 21.8 | ||
| Lock of fit | 5 | 218 | 43.6 | ||
| Pure error | 5 | 0 | 0 | ||
| Total | 9 | 149737 |
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