| Influencing factors | Label | Levels | ||
| 1 | 2 | 3 | ||
| Damage threshold (%) |
| 0.5 | 0.625 | 0.75 |
| Total cumulated plastic strain (%) |
| 50 | 60 | 70 |
| Damage index |
| 5 | 7.25 | 9.5 |