A set of arguments are required as part of the HELIUSPFA command.
HELIUSPFA, arg1, arg2, arg3, . . . , arg16
The table below provides a short description of the constitutive modeling issue controlled by each of the 16 possible arguments along with the allowable range of values for each constant. A detailed description of the arguments is found in Appendices A.1 through A.13.
| Argument | Constitutive Issue Controlled by the Argument | Allowable Values | Notes |
|---|---|---|---|
| 1 | Material Reference Number | Integer > 0 | |
| 2 | Number of State Variables to be tracked (SVARs) |
Unidirectional → 7 or 35 Woven → 7 or 90 |
|
| 3 | System of Units |
1 - N/m/K 2 - N/mm/K 3 - lb/in/R 4 - lb/ft/R 5 - Custom |
1 is default |
| 4 | Principal Material Coordinate System |
Unidirectional: 1 - (1 = fiber, 23 = plane of transverse isotropy) 2 - (2 = fiber, 13 = plane of transverse isotropy) Woven: 1 - (1 = fill tow, 2 = warp tow, 3 = out of plane) 2 - (2 = fill tow, 1 = warp tow, 3 = out of plane) 3 - (3 = fill tow, 2 = warp tow, 1 = out of plane) |
1 is default |
| 5 | Progressive Failure Analysis | 0 (off), 1 or 2 (on) | 2 is used in conjuction with Arguments 14 & 15 |
| 6 | Pre-Failure Nonlinearity |
Uni → 0 (off), 1 (on) Woven → 0 (off), 1 (on) |
0 is default, must have Argument 5 activated |
| 7 | Unused | 0 or blank | |
| 8 | Hydrostatic Strengthening | 0 (off), 1 (on - uni only) | 0 is default, must have Argument 5 activated |
| 9 | Temperature |
-1 (activate temperature dependence) value ≥ 0.0 (temperature corresponding to environment in mdata file) |
0 is default |
| 10 | Failure Criterion |
Uni → -1, 0, 1, 2, 3, 4, 5, 6, 7, 8 Woven → -1, 0, 1, 2 |
0 is default |
| 11 | Auxiliary Criterion Parameter | -1.0 ≤ value ≤ 1.0 | |
| 12 | Auxiliary Criterion Parameter | Must be > 0 | |
| 13 | Unused | 0 or blank | |
| 14 | Matrix Post Failure Stiffness | 0 < value ≤ 1 | |
| 15 | Fiber Post Failure Stiffness | 0 < value ≤ 1 | |
| 16 | Moisture |
0 (Ambient), 1 (Dry), 2 (Wet) |
0 is default |