Open Access
Table 5
ANOVA for response surface quadratic model of fatigue life.
| Sources | DF | Sum of square | Mean square | F-values | p-values |
|---|---|---|---|---|---|
| Model | 9 | 3.34571E+11 | 37174582486 | 12.66 | 0.000 |
| Linear | 3 | 28591980233 | 9530660078 | 3.25 | 0.069 |
| Plate thickness | 1 | 4295147209 | 4295147209 | 1.46 | 0.254 |
| Root gap | 1 | 16768979873 | 16768979873 | 5.71 | 0.038 |
| Load | 1 | 58327991 | 58327991 | 0.02 | 0.891 |
| Square | 3 | 76104503562 | 25368167854 | 8.64 | 0.004 |
| Plate thickness × plate thickness | 1 | 285081187 | 285081187 | 0.10 | 0.762 |
| Root gap × root gap | 1 | 70596493340 | 70596493340 | 24.04 | 0.001 |
| Load × load | 1 | 21036882 | 21036882 | 0.01 | 0.934 |
| 2-way interaction | 3 | 15953385510 | 5317795170 | 1.81 | 0.209 |
| Plate thickness × root gap | 1 | 15679810111 | 15679810111 | 5.34 | 0.043 |
| Plate thickness × load | 1 | 219255313 | 219255313 | 0.07 | 0.790 |
| Root gap × load | 1 | 70016073 | 70016073 | 0.02 | 0.880 |
| Error | 10 | 29360653988 | 2936065399 | ||
| Lock of fit | 5 | 29360653988 | 5872130798 | ||
| Pure error | 5 | 0 | 0 | ||
| Total | 19 | 3.63932E + 11 |
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