ABAQUS Volume II: I–Z User Manual
Page 609
*VISCOELASTIC
Optional parameters when test data are given to define time domain viscoelasticity with
TIME=CREEP TEST DATA or TIME=RELAXATION TEST DATA or when test data are given to
define frequency domain viscoelasticity with FREQUENCY=PRONY, FREQUENCY=CREEP TEST
DATA, or FREQUENCY=RELAXATION TEST DATA:
ERRTOL
Set this parameter equal to the allowable average root-mean-square error of the data points in the
least-squares fit. The default is 0.01 (1%).
NMAX
Set this parameter equal to the maximum number of terms N in the Prony series. ABAQUS will
perform the least-squares fit from
to
NMAX until convergence is achieved for the
lowest N with respect to ERRTOL. The default and maximum value is 13.
Data line to define continuum material properties for FREQUENCY=FORMULA:
First (and only) line:
1. Real part of
.
2. Imaginary part of
.
3. Value of a.
4. Real part of
.
If the material is incompressible, this value is ignored.
5. Imaginary part of
. If the material is incompressible, this value is ignored.
6. Value of b. If the material is incompressible, this value is ignored.
Data lines to define continuum material properties for FREQUENCY=TABULAR without the
PRELOAD parameter or for TIME=FREQUENCY DATA:
First line:
1. Real part of
.
2. Imaginary part of
.
3. Real part of
.
If the material is incompressible, this value is ignored.
4. Imaginary part of
.
If the material is incompressible, this value
is ignored.
5. Frequency, f, in cycles per time.
Repeat this data line as often as necessary to define the dissipative part of the material behavior.
Data lines to define continuum material properties for FREQUENCY=TABULAR,
PRELOAD=UNIAXIAL:
First line:
1. Uniaxial loss modulus.
2. Uniaxial storage modulus.
21.4–3
ABAQUS Version 6.1
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