Open Access
Table 5
ANOVA for the response surface quadratic model.
| Source | Sum of square | Degree of freedom | Mean square | F value | P value |
|---|---|---|---|---|---|
| Model | 0.017 | 9 | 1.88 × 10−3 | 19.53 | 0.0004 |
| A- spring stiffness | 4.91 × 10−3 | 1 | 4.91 × 10−3 | 50.98 | 0.0002 |
| B- Punch diameter | 7.91 × 10−4 | 1 | 7.91 × 10−4 | 8.22 | 0.0241 |
| C- blank holder limit height | 8.34 × 10−4 | 1 | 8.34 × 10−4 | 8.66 | 0.0216 |
| AB | 2.23 × 10−3 | 1 | 2.23 × 10−3 | 23.15 | 0.0019 |
| AC | 4.66 × 10−3 | 1 | 4.66 × 10−3 | 48.39 | 0.0002 |
| BC | 1.17 × 10−3 | 1 | 1.17 × 10−3 | 12.14 | 0.0102 |
| A2 | 2.28 × 10−5 | 1 | 2.28 × 10−5 | 0.24 | 0.6416 |
| B2 | 2.19 × 10−5 | 1 | 2.19 × 10−5 | 25.09 | 0.0021 |
| C2 | 5.47 × 10−3 | 1 | 5.47 × 10−3 | 62.54 | 0.0001 |
| Lack of fit | 3.81 × 10−4 | 2 | 1.91 × 10−4 | 3.25 | 0.1246 |
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