ABAQUS Volume II: I–Z - Manual (Page 619)

*VOLUMETRIC TEST DATA
Viscoelastic material model
References:
•
“Time domain viscoelasticity,” Section 17.7.1 of the ABAQUS Analysis User’s Manual
•
*VISCOELASTIC
Optional parameter:
VOLINF
To specify creep test data, set this parameter equal to the value of the long-term, normalized
volumetric compliance,
.
To specify relaxation test data, set this parameter equal to the value of the long-term,
normalized volumetric modulus .
The volumetric compliance is related to the volumetric modulus by . The
fitting procedure will use this value in the constraint .
Data lines to specify volumetric creep test data for a viscoelastic material:
First line:
1. Normalized volumetric (bulk) compliance .
2. Time .
Repeat this data line as often as necessary to give the compliance-time data.
Data lines to specify volumetric relaxation test data for a viscoelastic material:
First line:
1. Normalized volumetric (bulk) modulus .
2. Time .
Repeat this data line as often as necessary to give the modulus-time data.
21.7–3
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