Research Article
Multiobjective Optimization for Forming Process Parameters of Ultrahigh Strength Steel BR1500HS
Table 6
Analysis of variance (ANOVA) for the tensile strength.
| | Source | Sum of squares | Free degree | Mean square | F value | value |
| | Model | 307,461.3 | 5 | 61,492.26 | 41.90669 | <0.0001 | | T | 127.7921 | 1 | 127.7921 | 0.08709 | 0.7765 | | t | 3,888 | 1 | 3,888 | 2.649654 | 0.1476 | | T×t | 53.4361 | 1 | 53.4361 | 0.036416 | 0.8541 | | T2 | 282,574.3 | 1 | 282,574.3 | 192.5731 | <0.0001 | | t2 | 158.6806 | 1 | 158.6806 | 0.10814 | 0.7519 | | Residual | 5.537932 | 7 | 0.79113314 | — | — | | Lack of fit | 5.537932 | 3 | 1.84597733 | — | — | | Pure error | 0 | 4 | 0 | — | — | | Cor total | 317,732.8 | 12 | — | — | — | | R2 = 0.9677 | = 0.9446 | Pred R2 = 0.7738 | Adeq precision = 18.299 |
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