This manual shows you how to create and use your own user subroutines in Autodyn. Topics covered include:
How to invoke the user subroutines from Input
Compiling and linking user subroutines
Writing your own user subroutines
Description of Autodyn module variables
Autodyn provides you with a number of standard alternatives for options such as Equations of State, Yield Models, Boundary Conditions, and so on. However, you may wish to use your own custom models for these options. Autodyn allows you to do this by including your own subroutines written in Fortran. This guide shows you how to include these subroutines in your calculations and offers guidelines on writing user subroutines. Table 1.1: Material Modeling User Subroutines and Table 1.2: Additional User Subroutines show the user subroutines that are available for use with Autodyn.
Table 1.1: Material Modeling User Subroutines
| MDEOS_USER_1 | Custom equation of state (Previously EXEOS) |
| MDSTR_USER_1 | Custom yield and/or shear model (Previously EXYLD) |
| MDFAI_USER_1 | Custom failure criteria (Previously EXFAIL / EXFAILS) |
| MDERO_USER_1 | Custom erosion criteria (Previously EXEROD) |
| EXBULK | Custom bulk modulus for a linear EOS |
| EXCOMP | Custom porous compaction curve, P-α equation of state |
| EXCRCK | Custom tensile crack softening rate |
| EXDAM | Custom damage parameter |
| EXPLRN | Custom plastic flow return algorithm |
| EXSHR | Custom shear modulus |
| EXSTIF | Custom stiffness matrix, orthotropic-elastic with failure |
| EXTAB | Custom tabulated saturation curve for two-phase EOS |
Table 1.2: Additional User Subroutines
| EXACC | Apply user defined acceleration to a Lagrangian node |
| EXALE | Custom ALE (Arbitrary Lagrange Euler) grid motions |
| EXEDIT | Custom edits |
| EXFLOW | Custom Euler flow boundary |
| EXFOR3 | Custom Force Boundary on structured and unstructured nodes |
| EXFRICTION | User defined friction |
| EXLOAD | Loading additional, non-standard data from SAVE files |
| EXPOR | Custom variable polygon porosity |
| EXSAVE | Saving additional, non-standard data to SAVE files |
| EXSIE | Custom energy deposition |
| EXSTR | Custom stress boundary condition |
| EXVAL | Custom initial conditions |
| EXVEL | Custom velocity boundary condition |
| EXZONE | Custom nodal coordinates |
| EXORTHO_AXES | Custom define initial material axes for orthotropic materials |