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*TRS
Used to define temperature-time shift for time history viscoelastic analysis.

This option can be used only in conjunction with the *VISCOELASTIC option and, in Abaqus/Explicit, with the *VISCOSITY option.

In an Abaqus/Standard analysis, viscoelasticity must be defined in the time domain by using the *VISCOELASTIC option with the TIME parameter.

Products: Abaqus/Standard  Abaqus/Explicit  Abaqus/CAE  

Type: Model data

Level: Model  

Abaqus/CAE: Property module

References:

Optional parameters:

DEFINITION

Set DEFINITION=WLF (default) to define the shift function by the Williams-Landel-Ferry approximation.

Set DEFINITION=ARRHENIUS to define the shift function by the Arrhenius approximation.

Set DEFINITION=USER to define the shift function in user subroutine UTRS in Abaqus/Standard analyses or in user subroutine VUTRS in Abaqus/Explicit analyses.

PROPERTIES

This parameter applies only to Abaqus/Explicit analyses.

Set this parameter equal to the number of properties being entered. The properties are available for use in user subroutine VUTRS.

Data line to define the shift function by the Williams-Landel-Ferry approximation: 

First (and only) line:

  1. Reference temperature, .

  2. Calibration constant, .

  3. Calibration constant, .

Data line to define the shift function by the Arrhenius approximation: 

First (and only) line:

  1. Reference temperature, .

  2. Activation energy, .

In addition, you need to specify the universal gas constant and absolute zero using the *PHYSICAL CONSTANTS option.

To define a user-defined shift function: 

No data lines are used with this option in Abaqus/Standard analyses when DEFINITION=USER is specified. Instead, user subroutine UTRS must be used to define the shift function.

For Abaqus/Explicit analyses in which DEFINITION=USER is specified, data lines are used if the PROPERTIES parameter is also specified. In all cases user subroutine VUTRS must be used to define the shift function. The properties, if entered, are available for use in user subroutine VUTRS.

Data lines to define material properties when PROPERTIES is specified: 

First line:

  1. Enter the material properties, eight per line.

Repeat this data line as often as necessary to define all material properties.