The following tables describe the function of each available user subroutine.
Table A–3 ABAQUS/Standard user subroutines.
| Name | Function |
|---|---|
| CREEP | Define time-dependent, viscoplastic behavior (creep and swelling) |
| DFLOW | Define nonuniform pore fluid velocity in a consolidation analysis |
| DFLUX | Define nonuniform distributed flux in a heat transfer or mass diffusion analysis |
| DISP | Specify prescribed boundary conditions |
| DLOAD | Specify nonuniform distributed loads |
| FILM | Define nonuniform film coefficient and associated sink temperatures for heat transfer analysis |
| FLOW | Define nonuniform seepage coefficient and associated sink pore pressure for consolidation analysis |
| FRIC | Define frictional behavior for contact surfaces |
| GAPCON | Define conductance between contact surfaces or nodes in a fully coupled temperature-displacement analysis or pure heat transfer analysis |
| GAPELECTR | Define electrical conductance between surfaces in a coupled thermal-electric analysis |
| HARDINI | Define initial equivalent plastic strain and initial backstress tensor |
| HETVAL | Provide internal heat generation in heat transfer analysis |
| MPC | Define multi-point constraints |
| ORIENT | Provide an orientation for defining local material directions or local directions for kinematic coupling constraints or local rigid body directions for inertia relief |
| RSURFU | Define a rigid surface |
| SDVINI | Define initial solution-dependent state variable fields |
| SIGINI | Define an initial stress field |
| UCORR | Define cross-correlation properties for random response loading |
| UEL | Define an element |
| UEXPAN | Define incremental thermal strains |
| UEXTERNALDB | Manage user-defined external databases and calculate model-independent history information |
| UFIELD | Specify predefined field variables |
| UFLUID | Define fluid density and fluid compliance for hydrostatic fluid elements |
| UFLUIDLEAKOFF | Define the fluid leak-off coefficients for pore pressure cohesive elements |
| UGENS | Define the mechanical behavior of a shell section |
| UHARD | Define the yield surface size and hardening parameters for isotropic plasticity or combined hardening models |
| UHYPEL | Define a hypoelastic stress-strain relation |
| UHYPER | Define a hyperelastic material |
| UINTER | Define surface interaction behavior for contact surfaces |
| UMASFL | Specify prescribed mass flow rate conditions for a convection/diffusion heat transfer analysis |
| UMAT | Define a material's mechanical behavior |
| UMATHT | Define a material's thermal behavior |
| UMESHMOTION | Specify mesh motion constraints during adaptive meshing |
| UMOTION | Specify motions during cavity radiation heat transfer analysis or steady-state transport analysis |
| UMULLINS | Define damage variable for the Mullins effect material model |
| UPOREP | Define initial fluid pore pressure |
| UPRESS | Specify prescribed equivalent pressure stress conditions |
| UPSD | Define the frequency dependence for random response loading |
| URDFIL | Read the results file |
| USDFLD | Redefine field variables at a material point |
| UTEMP | Specify prescribed temperatures |
| UTRACLOAD | Specify nonuniform traction loads |
| UTRS | Define a reduced time shift function for a viscoelastic material |
| UVARM | Generate element output |
| UWAVE | Define wave kinematics for an ABAQUS/Aqua analysis |
| VOIDRI | Define initial void ratios |