*TRS
19.14 *TRS: Used to define temperature-time shift for time history viscoelastic analysis.
This option can be used only in conjunction with the *VISCOELASTIC 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
Type: Model data
Level: Model
References:
•“Time domain viscoelasticity,”Section 17.7.1 of the ABAQUS Analysis User’s Manual
•“UTRS,” Section 1.1.43 of the ABAQUS User SubroutinesReference Manual
•*VISCOELASTIC
Optional parameter:
DEFINITION
This parameter applies only to ABAQUS/Standard analy ses. In an ABAQUS/Explicit analysis the
Williams-Landell-Ferryapproximation is the only available choice.
Set DEFINITION=WLF (default) to define the shift function by the Williams-Landell-Ferry
approximation.
Set DEFINITION=USER to define the shift function in user subroutineUTRS.
Data line to define the shift function by the Williams-Landell-Ferr y approximation:
First (and only) line:
1. Referencetemperature, .
2. Calibrationconstant, .
3. Calibrationconstant, .
To definea shiftfunction not approximated by the WLF function:
No data lines are used with this option when DEFINITION=USER is specified. Instead, user
subroutine UTRS must be used to define the shift function.
19.14–1
ABAQUS Version 6.1 Module: ID:
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