Table 2.
Material properties used in the current study.
| Segments | MAT | R0 (t/mm3) | E (MPa)/K (N/mm) | Poisson ratio | A ∗ (MPa) | B ∗ (MPa) | N | C | PSFAIL | SIGMAX (MPa) |
|---|---|---|---|---|---|---|---|---|---|---|
| Cortical bone | 98 | 1.83E − 09 | 11,740 | 0.3 | 106.7 | 100 | 0.1 | 1 | 9.40E − 03 | 150 |
| Cancellous bone | 98 | 1.80E − 10 | 259 | 0.25 | 1.71 | 20 | 1 | 1 | 1.30E − 02 | 1.985 |
| Endplate vertebra | 98 | 1.06E − 09 | 9450 | 0.3 | 5.67 | 100 | 1 | 3 | 1.89E − 02 | 7.1 |
| Endplate disc | 1 | 1.20E − 09 | 200 | 0.3 | ||||||
| Disc annulus | 27 | 1.20E − 09 | 0.49 | 0.24 | −0.06 | |||||
| Disc nucleus | 27 | 1.00E − 09 | 0.495 | 0.64 | −0.16 | |||||
| Fiber | 71 | 1.20E − 09 | Curves | |||||||
| Ligaments | 74 | 1.00E − 09 |
∗In LS_DYNA material keywords, the strain energy density of MAT_MOONEY-RIVLIN_RUBBER is defined as a function of constant A, constant B, and Poisson ratio [16].