ABAQUS Keywords Reference Manual  

*DRUCKER PRAGER CREEP
Specify a Drucker-Prager creep law and material properties.

This option is used to define a Drucker-Prager creep model and material properties. Creep behavior defined by this option is active only during *SOILS, CONSOLIDATION; *COUPLED TEMPERATURE-DISPLACEMENT; and *VISCO procedures. It must be used in conjunction with the *DRUCKER PRAGER and *DRUCKER PRAGER HARDENING options. The data entered must be consistent with the TYPE parameter used on the *DRUCKER PRAGER HARDENING option.

Product: ABAQUS/Standard  

Type: Model data

Level: Model  

References:

Optional parameters:

DEPENDENCIES

Set this parameter equal to the number of field variable dependencies included in the definition of the creep constants, in addition to temperature. If this parameter is omitted, it is assumed that the creep constants depend only on temperature. See “Specifying field variable dependence” in “Material data definition,” Section 9.1.2 of the ABAQUS Analysis User's Manual, for more information.

LAW

Set LAW=STRAIN (default) to choose a strain-hardening power law.

Set LAW=TIME to choose a time-hardening power law.

Set LAW=SINGHM to choose a Singh-Mitchell type law.

Set LAW=USER to input the creep law using user subroutine CREEP.

Data lines for LAW=TIME or LAW=STRAIN: 

First line:

  1. . (Units of FLT.)

  2. .

  3. .

  4. Temperature.

  5. First field variable.

  6. Etc., up to four field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four):

  1. Fifth field variable.

  2. Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the dependence of the creep constants on temperature and other predefined field variables.

Data lines for LAW=SINGHM: 

First line:

  1. . (Units of T–1.)

  2. . (Units of F–1L2.)

  3. .

  4. . (Units of T.)

  5. Temperature.

  6. First field variable.

  7. Etc., up to three field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than three):

  1. Fourth field variable.

  2. Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the dependence of the creep constants on temperature and other predefined field variables.