This option is used to analyze problems where the simultaneous solution of the temperature and stress/displacement fields is necessary.
Product: ABAQUS/Standard
Type: History data
Level: Step
Set CREEP=EXPLICIT to use explicit integration for creep and swelling effects throughout the step, which may sometimes be computationally less expensive. When CREEP=EXPLICIT, the time increment will be limited by the accuracy tolerances (CETOL and DELTMX) and also by the stability limit of the forward difference operator. See “Rate-dependent plasticity: creep and swelling,” Section 11.2.4 of the ABAQUS Analysis User's Manual for details on the integration scheme.
Set CREEP=NONE to specify that there is no creep or viscoelastic response occurring during this step even if creep or viscoelastic material properties have been defined.
Set this parameter equal to the damping factor to be used in the automatic damping algorithm (see “Solving nonlinear problems,” Section 8.2.1 of the ABAQUS Analysis User's Manual) if the problem is expected to be unstable due to local instabilities and the damping factor calculated by ABAQUS/Standard is not suitable. This parameter must be used in conjunction with the STABILIZE parameter and overrides the automatic calculation of the damping factor based on a value of the dissipated energy fraction.
Include this parameter to use automatic stabilization if the problem is expected to be unstable due to local instabilities. Set this parameter equal to the dissipated energy fraction of the automatic damping algorithm (see “Solving nonlinear problems,” Section 8.2.1 of the ABAQUS Analysis User's Manual). If this parameter is omitted, the stabilization algorithm is not activated. If this parameter is included without a specified value, the default value of the dissipated energy fraction is 2 × 10–4. If the FACTOR parameter is used, any value of the dissipated energy fraction will be overriden by the damping factor.
Include this parameter to choose steady-state analysis. If this parameter is omitted, the step is assumed to involve transient response.
Set this parameter equal to the maximum difference in the creep strain increment calculated from the creep strain rates at the beginning and at the end of the increment, thus controlling the accuracy of the creep integration. The tolerance is sometimes calculated by choosing an acceptable stress error tolerance and dividing by a typical elastic modulus. This parameter is meaningful only when the material response is time dependent (creep and swelling). If both this parameter and the DELTMX parameter are omitted, fixed time stepping will be used, with a constant time increment equal to the initial time increment.
Set this parameter equal to the maximum temperature change allowed within an increment. ABAQUS/Standard will restrict the time step to ensure that this value is not exceeded at any node during any increment of the step. If both this and the CETOL parameter are omitted, fixed time stepping will be used, with a constant time increment equal to the initial time increment.
First (and only) line:
Suggested initial time increment. If automatic incrementation is used, this should be a reasonable suggestion for the initial increment size and will be adjusted as necessary. If direct incrementation is used, this will be the fixed time increment size.
Total time period for the step.
Minimum time increment allowed. If ABAQUS/Standard finds it needs a smaller time increment than this value, the analysis is terminated. If this entry is zero, a default value of the smaller of the suggested initial time increment or 10–5 times the total time period is assumed. This value is used only for automatic time incrementation.
Maximum time increment allowed. If this value is not specified, the default upper limit is the total time period for the step. This value is used only for automatic time incrementation.