Table 4 Central composite design factor coding.
From: Bending mechanics test and parameters calibration of ramie stalks
Factor Level | Parameter | ||
|---|---|---|---|
Rolling friction coefficient X1 | Phloem Poisson's ratio X2 | Xylem Poisson's ratio X3 | |
1.682 | 0.15 | 0.4 | 0.4 |
1 | 0.13 | 0.36 | 0.36 |
0 | 0.1 | 0.3 | 0.3 |
−1 | 0.07 | 0.24 | 0.24 |
−1.682 | 0.05 | 0.2 | 0.2 |
