*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.

This page discusses:

See Also
*DRUCKER PRAGER
*DRUCKER PRAGER HARDENING
In Other Guides
Extended Drucker-Prager Models
CREEP

ProductsAbaqus/StandardAbaqus/CAE

TypeModel data

LevelModel

Abaqus/CAEProperty module

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 Material Data Definition for more information.

LAW

Set LAW=STRAIN (default) to choose a strain hardening law. This parameter setting is superseded by LAW=POWER LAW.

Set LAW=TIME to choose a time hardening law. This parameter setting is superseded by LAW=TIME POWER LAW.

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

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

Set LAW=POWER LAW to choose a power law. It is recommended that you use this parameter setting rather than LAW=STRAIN.

Set LAW=TIME POWER LAW to choose a time power law. It is recommended that you use this parameter setting rather than LAW=TIME.

TIME

This parameter is relevant only when LAW=TIME, LAW=SINGHM, or LAW=TIME POWER LAW is used.

Set TIME=CREEP to use creep time.

Set TIME=TOTAL (default) to use total time.

Data lines for LAW=TIME or LAW=STRAIN

First line

  1. A. (Units of F​-nL​2⁢nT​-1-m.)

  2. n.

  3. m.

  4. Temperature.

  5. First field variable.

  6. Second field variable.

  7. 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. A. (Units of T−1.)

  2. α. (Units of F−1L2.)

  3. m.

  4. t1. (Units of T.)

  5. Temperature.

  6. First field variable.

  7. Second field variable

  8. Third field variable.

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.

Data lines for LAW=POWER LAW

First line

  1. q0. (Units of FL−2.)

  2. n.

  3. m.

  4. Blank space.

  5. ε˙0. The default is 1.0. (Units of T−1.)

  6. Temperature.

  7. First field variable.

  8. Second field variable.

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

  1. Third 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=TIME POWER LAW

First line

  1. q0. (Units of FL−2.)

  2. n.

  3. m.

  4. ε˙0. The default is 1.0. (Units of T−1.)

  5. Temperature.

  6. First field variable.

  7. Second field variable.

  8. Third field variable.
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.