*VISCOELASTIC
3. Frequency,f, in cycles per time.
4. Uniaxialnominal strain (defines the level of uniaxial preload).
Repeat this data line as often as necessary to define the uniaxial loss and storage moduli as functions
of frequency and preload.
Data lines to define continuum material properties for FREQUENCY=TABULAR,
PRELOAD=VOLUMETRIC:
First line:
1. Bulkloss m odulus.
2. Bulkstorage modulus.
3. Frequency,f, in cycles per time.
4. Volume ratio, J(current volume/original volume; defines the level of volum etric preload).
Repeat this data line as often as necessary to define the bulk loss and storage moduli as functions of
frequency and preload.
Data lines to specify continuum material properties with the Pronyseries parameters directly
using TIME=PRONY or FREQUENCY=PRONY:
First line:
1. , the modulus ratio in the first term in the Prony series expansio n of the shear relaxation
modulus.
2. , the modulus ratio in the first term in the Prony series expansi on of the bulk relaxation
modulus.
3. , the relaxation time for the first term in the Prony series expansion.
Repeat this data line as often as necessary to define the second, third, etc. terms in the Prony series.
There is no restriction on the number of terms in the Prony series.
To specify viscoelasticbehavior via test data:
No data lines are used with this option when either TIME=CREEP TEST DATA or
TIME=RELAXATION TEST DATA is specified. The test data are given by the *SHEAR
TEST DATAand the *VOLUMETRIC TEST DATAoptions or by the *COMBINED TEST DATA
option.
Data lines to define effective thickness-directiongasket properties for PRELOAD=UNIAXIAL:
First line:
1. Effectivethickness-direction loss modulus.
2. Effective thickness-direction storage modulus.
3. Frequency,f, in cycles per time.
21.4–4
ABAQUS Version 6.1 Module: ID:
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