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*VISCOUS
Specify viscous material properties for the two-layer viscoplastic model.

This option is used to define the viscous properties for the two-layer viscoplastic material model. It must be used in conjunction with the *ELASTIC and *PLASTIC options.

Products: Abaqus/Standard  Abaqus/CAE  

Type: Model data

Level: Model  

Abaqus/CAE: Property module

References:

Optional parameters:

DEPENDENCIES

Set this parameter equal to the number of field variable dependencies included in the definition of the material properties, in addition to temperature. If this parameter is omitted, it is assumed that the material properties depend only on temperature. See “Specifying field variable dependence” in “Material data definition,” Section 21.1.2 of the Abaqus Analysis User's Guide, 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=USER to input the creep law using user subroutine CREEP.

Set LAW=ANAND to choose an Anand law.

Set LAW=DARVEAUX to choose a Darveaux law.

Set LAW=DOUBLE POWER to choose a double power law.

TIME

This parameter is relevant only when LAW=TIME.

Set TIME=CREEP to use creep time in the time-hardening relation.

Set TIME=TOTAL (default) to use total time in the time-hardening relation.

Data lines for LAW=TIME or LAW=STRAIN: 

First line:

  1. A. (Units of FLT.)

  2. n.

  3. m.

  4. f.

  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 viscous constants on temperature and other predefined field variable.

Data lines for LAW=USER: 

First line:

  1. f.

  2. Temperature.

  3. First field variable.

  4. Second field variable.

  5. Etc. up to seven field variables.

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

  1. Eighth 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 viscous constants on temperature and other predefined field variables.

Data lines for LAW=ANAND: 

First line:

  1. S1. (Units of FL–2.)

  2. . (Units of .)

  3. A. (Units of T–1.)

  4. .

  5. m.

  6. A0. (Units of FL–2.)

  7. . (Units of FL–2.)

  8. n.

Second line:

  1. a.

  2. S2. (Units of FL–2.)

  3. S3. (Units of FL–2.)

  4. A1. (Units of FL–2.)

  5. A2. (Units of FL–2.)

  6. A3. (Units of FL–2T.)

  7. A4. (Units of FL–2T2.)

  8. f.

Data lines for LAW=DARVEAUX: 

First line:

  1. Css. (Units of T–1.)

  2. . (Units of .)

  3. . (Units of F–1L2.)

  4. n.

  5. .

  6. B.

  7. f.

Data lines for LAW=DOUBLE POWER: 

First line:

  1. A1. (Units of T–1.)

  2. B1. (Units of .)

  3. C1.

  4. A2. (Units of T–1.)

  5. B2. (Units of .)

  6. C2.

  7. . (Units of FL–2.)

  8. f.