ABAQUS Volume II: I–Z - Manual (Page 577)

*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 Subroutines Reference Manual
•
*VISCOELASTIC
Optional parameter:
DEFINITION
This parameter applies only to ABAQUS/Standard analyses. In an ABAQUS/Explicit analysis the
Williams-Landell-Ferry approximation 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 subroutine UTRS.
Data line to define the shift function by the Williams-Landell-Ferry approximation:
First (and only) line:
1. Reference temperature, .
2. Calibration constant, .
3. Calibration constant, .
To define a shift function 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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