Table 1. Material properties of the finite element model.
| Component | Young’s modulus E (MPa) | Poisson’s ratio | Source |
|---|---|---|---|
| Bone | 10,000 | 0.3 | Goel & Clausen (1998) |
| Brain | 0.01 | 0.45 | Soza et al. (2005) |
| Annulus fibrous | 450 | 0.45 | Goel & Clausen (1998) |
| Nucleus pulposus | 1 | 0.475 | Mo et al. (2014) |
| Encapsulated soft tissue | Hyperelastic (C10, C01, C20, C11, C02, D1, D2) = (0.08556, −0.05841, 0.03900, −0.02319, 0.00851, 3.65273, 0) | Lemmon et al. (1997), Wang et al. (2015) | |
| Pillow/Elevation mat | 0.054 | 0.045 | Measured by material testing machine |
| Bed | 2 | 0.3 | |