Open Access
Table 2
Analysis of variance results for springback.
| Source | Adj SS | Adj MS | F-Value | P-Value |
|---|---|---|---|---|
| Model | 23.9430 | 1.19715 | 8.57 | 0.000 |
| Linear | 12.4283 | 2.48566 | 17.79 | 0.000 |
| A = Punch travel | 4.1611 | 4.16105 | 29.78 | 0.000 |
| B = Strain hardening index | 5.3875 | 5.38751 | 38.56 | 0.000 |
| C = Holding time | 0.0403 | 0.04033 | 0.29 | 0.602 |
| D = Punch velocity | 1.3727 | 1.37267 | 9.82 | 0.010 |
| E = Width of the sheet | 0.8078 | 0.80775 | 5.78 | 0.035 |
| Square | 3.4754 | 0.69508 | 4.97 | 0.013 |
| A × A | 0.2007 | 0.20074 | 1.44 | 0.256 |
| B × B | 1.1672 | 1.16717 | 8.35 | 0.015 |
| C × C | 0.1458 | 0.14583 | 1.04 | 0.329 |
| D × D | 0.1986 | 0.19863 | 1.42 | 0.258 |
| E × E | 1.1806 | 1.18056 | 8.45 | 0.014 |
| 2-Way | 10.8360 | 1.08360 | 7.75 | 0.001 |
| A × B | 0.3254 | 0.32536 | 2.33 | 0.155 |
| A × C | 0.0006 | 0.00059 | 0.00 | 0.949 |
| A × D | 0.4402 | 0.44019 | 3.15 | 0.104 |
| A × E | 0.0870 | 0.08701 | 0.62 | 0.447 |
| B × C | 1.2764 | 1.27642 | 9.13 | 0.012 |
| B × D | 3.7141 | 3.71405 | 26.58 | 0.000 |
| B × E | 1.9907 | 1.99074 | 14.25 | 0.003 |
| C × D | 0.0028 | 0.00279 | 0.02 | 0.890 |
| C × E | 3.0899 | 3.08989 | 22.11 | 0.001 |
| D × E | 0.0321 | 0.03213 | 0.23 | 0.641 |
| Error | 1.5370 | 0.13973 | – | – |
| Lack-of-fit | 0.4370 | 0.07284 | 0.33 | 0.895 |
| Pure error | 1.1000 | 0.22000 | – | – |
| Total | 25.4800 | – | – | – |
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