Appendix A - MATPFA Fields
View details of each field in the MATPFA entry.
The table below provides a short description of the feature controlled by each MATPFA field along with the allowable range of values for each field.
| Field | Constitutive Issue Controlled by the Field | Allowable Values |
|---|
| MID | Material Identification Number | Integer |
| MIDH | Helius PFA Material Identification Number | Integer referencing mdata file |
| PDIR | Principal Material Coordinate System | Unidirectional → 1, 2 Woven → 1, 2, 3 |
| FT | Failure Theory | Uni → MCT, STRESS, STRAIN, HILL, TSAI, CHRI, HASH, PUCK, LaRC02, USER Woven → MCT, STRESS, STRAIN, USER |
MPSTIF MDE | Matrix Post Failure Stiffness Matrix Degradation Energy | 0.0 < value ≤ 1.0 value > 0.0 |
FPSTIF FDE | Fiber Post Failure Stiffness Fiber Degradation Energy | 0.0 < value ≤ 1.0 value > 0.0 |
| DEVO | Damage Evolution Method | INSTANT, ENERGY |
| PRENL | Pre-Failure Nonlinearity | OFF, ON |
| TREF | Temperature Flag | -1 (activate temperature dependence) value ≥ 0.0 (temperature corresponding to environment in mdata file) |
| MOIST | Moisture Flag | AMBIENT, DRY, WET |
F ALPHA | Cross-product Term in Tsai-Wu FC Contribution of Longitudinal Shear Stress for Hashin FC | Real Number Real Number |
| SBIAX | Equibiaxial Stress at Failure for Tsai-Wu FC | Real Number |
| PFTYPE | Progressive Failure Analysis Type | Uni → 0 (off), 1 (on) Woven → 0 (off), 1 or 2 (on) |
| HYDRO | Hydrostatic Strengthening | OFF, ON |
The remainder of Appendix A discusses each MATPFA field in detail, including the impact of the field on the multiscale constitutive relations used to represent the composite material.