Table 2: Meta-model.
No. E1 (mm) E2 (mm) Springback angle y(t) (mm) y( t ^ ) (mm) RMSE
1 0.8686 0.8821 0.83 0.83 9.98513E-20
2 0.9675 0.0216 0.87 0.87 7.56386E-21
3 0.7532 0.9514 0.79 0.79 1.52058E-21
4 1.0714 0.0833 0.95 0.95 3.56237E-23
5 0.6225 0.2269 0.63 0.63 1.97131E-22
6 1.022 0.7181 0.93 0.93 1.82258E-20
7 3.1961 0.433 1.018 1.018 3.63055E-23
8 1.4717 0.292 0.98 0.98 5.18697E-21
9 1.269 0.3481 0.8563 0.8563 2.80668E-21
10 1.2346 0.3721 0.912 0.912 8.97391E-22
11 2.9237 0.26 0.9965 0.9965 3.02769E-21
12 1.1263 0.7736 0.756 0.756 4.35537E-21
13 1.3176 0.8251 0.7935 0.7935 2.8887E-22
14 0.6945 0.2513 0.9154 0.9154 1.85162E-21
15 1.4231 0.0598 0.7813 0.7813 1.44183E-21
16 1.4005 0.6312 0.8364 0.8364 5.46909E-21
17 1.0968 0.667 0.9534 0.9534 3.48141E-21
18 0.7239 0.79 0.8143 0.8143 1.44615E-21
19 1.3689 0.9261 0.8856 0.8856 2.44568E-23
20 0.9578 0.9872 0.89332 0.89332 6.4239E-23
21 1.224 0.4696 1.5465 1.5465 1.21608E-22
22 0.8985 0.1613 0.9058 0.9058 3.56237E-23
23 1.453 0.8455 0.9134 0.9134 1.69446E-22
24 0.6863 0.9904 0.9575 0.9575 2.30168E-21
25 1.044 0.1995 0.9649 0.9649 1.6797E-21
26 3.8065 0.7255 1.27 1.27 3.48141E-21
27 1.3269 0.3914 0.9705 0.9705 2.8887E-22
28 4.8288 0.4832 0.8725 0.8725 1.82258E-20
29 1.1453 0.1327 0.8147 0.8147 1.44615E-21
30 0.6586 0.6053 0.9217 0.9217 5.18697E-21