About User Subroutines

User subroutines increase the functionality of capabilities for which the usual data input methods alone might be too restrictive.

See Also
Linking a User Subroutine
In Other Guides
About User Subroutines and Utilities
Making User-Defined Executables and Subroutines

By linking Abaqus user subroutines to an analysis case, you can provide complex, user-defined definitions for some features. To add a user subroutine to a simulation, you must do the following:

  • Save each user subroutine as a single library file (DLL or SO) in the 3DEXPERIENCE platform.
  • Build the library file in a command prompt using the Abaqus Python driver utility (abaqus make).

The following subroutines are supported:

Abaqus User Subroutine Description
CREEP User-defined creep behavior.
UANISOHYPER_STRAIN User-defined anisotropic hyperelasticity.
UHYPER User-defined isotropic hyperelasticity.
UMAT User-defined mechanical behavior.
UHARD User-defined hardening.
UCREEPNETWORK User-defined nonlinear viscoelastic networks.

The solver manages user subroutines as it processes your simulation.

Each user subroutine also requires a "user-defined" type selection in the appropriate action. For example, to calibrate a material model using user-defined mechanical behavior, you must select a User-defined Material when you specify your choice of material model.