Table 2 L9 orthogonal array with three design parameters including rotation angle \({\varvec{\theta}}\), shape constant a, and length of Primitive-based unit cell L.
Design parameter | Response | ||||
|---|---|---|---|---|---|
\(\theta\)(°) | a | L (mm) | Vertical stiffness (N/mm) | Energy absorption (mJ) | Poisson’s ratio |
0 | 0.3 | 18 | 1.62 | 48.5 | − 0.190 |
0 | 0.4 | 20 | 3.56 | 191.4 | − 0.150 |
0 | 0.5 | 22 | 4.55 | 310.0 | − 0.024 |
10 | 0.3 | 20 | 2.78 | 101.6 | − 0.210 |
10 | 0.4 | 22 | 4.64 | 283.7 | − 0.055 |
10 | 0.5 | 18 | 1.70 | 77.7 | − 0.320 |
20 | 0.3 | 22 | 4.38 | 162.1 | − 0.063 |
20 | 0.4 | 18 | 0.96 | 54.4 | − 0.220 |
20 | 0.5 | 20 | 2.08 | 82.9 | − 0.270 |
