ABAQUS Volume II: I–Z - Manual (Page 435)

*SOILS
18.21 *SOILS: Effective stress analysis for fluid-filled porous media.
This option is used to specify transient (consolidation) or steady-state response analysis of partially or fully
saturated fluid-filled porous media.
Product: ABAQUS/Standard
Type: History data
Level: Step
References:
•
“Coupled pore fluid diffusion and stress analysis,” Section 6.7.1 of the ABAQUS Analysis User’s Manual
•
“Rate-dependent plasticity: creep and swelling,” Section 18.2.4 of the ABAQUS Analysis User’s Manual
Optional parameters:
CETOL
This parameter will invoke automatic time incrementation. If both the UTOL and CETOL
parameters are omitted, fixed time increments will be used.
This parameter is meaningful only when the material response includes time-dependent creep
behavior; CETOL controls the accuracy of the creep integration. Set this parameter equal to the
maximum allowable difference in the creep strain increment calculated from the creep strain rates at
the beginning and at the end of the increment (see “Rate-dependent plasticity: creep and swelling,”
Section 18.2.4 of the ABAQUS Analysis User’s Manual).
The tolerance can be calculated by choosing an acceptable stress error tolerance and dividing
by a typical elastic modulus.
CONSOLIDATION
Include this parameter to choose transient (consolidation) analysis. Omit this parameter to choose
steady-state analysis.
END
This parameter is meaningful only for transient analysis. Set END=PERIOD (default) to analyze a
specified time period. Set END=SS to end the step when steady state is reached.
CREEP
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.
18.21–1
ABAQUS Version 6.1 Module: ID:
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