Helius PFA Material Property Definition
Description: Defines the material properties for composite materials used with Helius PFA.
Format:
Example:
| Field | Definition | Type | Default |
|---|---|---|---|
| MID | Material identification number. | Integer > 0 | Required |
| MIDH | Helius PFA Material identification number. | Integer | Required |
| PDIR | Principal material coordinate system |
Unidirectional → 1, 2 Woven → 1, 2, 3 |
1 |
| FT | Failure Theory |
Uni → MCT, STRESS, STRAIN, HILL, TSAI, CHRIS, HASH, PUCK, LaRC02, USER Woven → MCT, STRESS, STRAIN, USER |
MCT |
|
MPSTIF MDE |
Matrix Post Failure Stiffness Matrix Degradation Energy |
0.0 < value ≤ 1.0 value > 0.0 |
Required |
|
FPSTIF FDE |
Fiber Post Failure Stiffness Fiber Degradation Energy |
0.0 < value ≤ 1.0 value > 0.0 |
Required |
| DEVO | Damage Evolution Method | INSTANT, ENERGY | INSTANT |
| PRENL | Pre-Failure Nonlinearity | OFF, ON | OFF |
| TREF | Temperature Flag |
-1 (activate temperature dependence) value ≥ 0.0 (temperature corresponding to environment in mdata file) |
|
| MOIST | Moisture Flag | AMBIENT, DRY, WET | AMBIENT |
|
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) |
0 |
| HYDRO | Hydrostatic Strengthening | OFF, ON | OFF |
Refer to Appendix A of the Helius PFA User's Guide for Autodesk Nastran for more details on each MATPFA field.