Optional, mutually exclusive parameters
- TEST DATA INPUT
-
Include this parameter if the material constants are to be computed by
Abaqus
from data taken from simple tests on a material specimen. If this parameter is
omitted, the material constants can be given directly on the data lines or the
damage variable can be defined through user subroutine
UMULLINS in
Abaqus/Standard
or
VUMULLINS in
Abaqus/Explicit.
- USER
-
Include this parameter if the damage variable defining the Mullins effect is
defined in user subroutine
UMULLINS in
Abaqus/Standard
or
VUMULLINS in
Abaqus/Explicit.
Optional parameters
- BETA
-
This parameter can be used only when the TEST DATA INPUT parameter is used; it defines the value of
while the other coefficients of the Mullins effect model are fitted from the
test data. It cannot be specified if both the R and M parameters are also specified (use the data line instead to
specify all three parameters). If this parameter is omitted,
will be determined from a nonlinear, least-squares fit of the test data.
Allowable values of BETA are .
The M and BETA parameters cannot both be zero.
- DEPENDENCIES
-
Set this parameter equal to the number of field variables, in addition to
temperature, on which the material parameters depend. If this parameter is
omitted, it is assumed that the material parameters are constant or depend only
on temperature.
See Material Data Definition for more information.
This parameter is not relevant if the USER or the TEST DATA INPUT parameter is included.
- M
-
This parameter can be used only when the TEST DATA INPUT parameter is used; it defines the value of
m while the other coefficients of the Mullins effect model
are fitted from the test data. It cannot be specified if both the R and BETA parameters are also specified (use the data line instead to
specify all three parameters). If this parameter is omitted,
m will be determined from a nonlinear, least-squares fit
of the test data. Allowable values of M are .
The M and BETA parameters cannot both be zero.
- PROPERTIES
-
This parameter can be used only if the USER parameter is specified. Set this parameter equal to the number
of property values needed as data in user subroutine
UMULLINS in
Abaqus/Standard
or
VUMULLINS in
Abaqus/Explicit.
The default value is 0.
- R
-
This parameter can be used only when the TEST DATA INPUT parameter is used; it defines the value of
r while the other coefficients of the Mullins effect model
are fitted from the test data. It cannot be specified if both the M and BETA parameters are also specified (use the data line instead to
specify all three parameters). If this parameter is omitted,
r will be determined from a nonlinear, least-squares fit
of the test data. Allowable values of R are .
To define the
material behavior by giving test data
No data
lines are used with this option when the TEST DATA INPUT parameter is specified. The data are given instead under the
BIAXIAL TEST DATA,
PLANAR TEST DATA, and
UNIAXIAL TEST DATA options. These options are applicable except for the case
where the damage variable is defined by the user.
Data lines to
define the material constants if both the TEST DATA INPUT and USER parameters are omitted
- First line
-
r.
-
m. (Units of FL–2.)
-
(If this entry is left blank, the default value is taken to be 0.0 in
Abaqus/Standard
and 0.1 in
Abaqus/Explicit.)
-
Temperature.
-
First field variable.
-
Etc., up to four field variables.
- Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four)
-
Fifth field variable.
-
Etc., up to eight field variables per line.
Repeat this set of data lines as often as necessary to
define the material constants as a function of temperature and other predefined
field variables.
Data lines to
define the material properties if the USER parameter is specified
- No data lines are needed if the PROPERTIES parameter is omitted or set to 0. Otherwise, first
line
-
Material properties, eight per line.
Repeat this data line as often as necessary to define the
material properties.