A.2 User subroutine functions listing

The following tables describe the function of each available user subroutine.

Abaqus/Standard User Subroutines

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

Abaqus/Explicit User Subroutines

Name	Function
`VDISP`	User subroutine to specify prescribed boundary conditions.
`VDLOAD`	User subroutine to specify nonuniform distributed loads.
`VFABRIC`	User subroutine to define fabric material behavior.
`VFRIC`	User subroutine to define frictional behavior for contact surfaces.
`VFRIC_COEF`	User subroutine to define the frictional coefficient for contact surfaces.
`VFRICTION`	User subroutine to define frictional behavior for contact surfaces.
`VUAMP`	User subroutine to specify amplitudes.
`VUANISOHYPER_INV`	User subroutine to define anisotropic hyperelastic material behavior using the invariant formulation.
`VUANISOHYPER_STRAIN`	User subroutine to define anisotropic hyperelastic material behavior based on Green strain.
`VUEL`	User subroutine to define an element.
`VUFIELD`	User subroutine to specify predefined field variables.
`VUHARD`	User subroutine to define the yield surface size and hardening parameters for isotropic plasticity or combined hardening models.
`VUINTER`	User subroutine to define the interaction between contact surfaces.
`VUINTERACTION`	User subroutine to define the contact interaction between surfaces with the general contact algorithm.
`VUMAT`	User subroutine to define material behavior.
`VUSDFLD`	User subroutine to redefine field variables at a material point.
`VUTRS`	User subroutine to define a reduced time shift function for a viscoelastic material.
`VUVISCOSITY`	User subroutine to define the shear viscosity for equation of state models.