ProductsAbaqus/StandardAbaqus/ExplicitAbaqus/CAE
TypeModel data
LevelModel
Abaqus/CAEProperty module
Optional, mutually exclusive parameters
- FUNG-ANISOTROPIC
Include this parameter to use the generalized Fung anisotropic strain energy
potential.
- FUNG-ORTHOTROPIC
Include this parameter to use the generalized Fung orthotropic strain energy
potential.
- HOLZAPFEL
Include this parameter to use the Holzapfel-Gasser-Ogden strain energy
potential.
- USER
Include this parameter if the strain energy potential and its derivatives
are defined in a user subroutine (user subroutines
UANISOHYPER_INV and
UANISOHYPER_STRAIN in
Abaqus/Standard
or
VUANISOHYPER_INV and
VUANISOHYPER_STRAIN in
Abaqus/Explicit).
Required parameters if the USER parameter is included
- FORMULATION
Set FORMULATION=STRAIN to indicate that the anisotropic hyperelastic energy potential
is formulated in terms of the components of the Green strain tensor and is
defined by either
UANISOHYPER_STRAIN in
Abaqus/Standard
or
VUANISOHYPER_STRAIN in
Abaqus/Explicit.
Set FORMULATION=INVARIANT to indicate that the anisotropic hyperelastic energy potential
is formulated in terms of pseudo-invariants and is defined by either
UANISOHYPER_INV in
Abaqus/Standard
or
VUANISOHYPER_INV in
Abaqus/Explicit.
- TYPE
This parameter applies only to
Abaqus/Standard
analyses.
Set TYPE=INCOMPRESSIBLE to indicate that the anisotropic hyperelastic material defined
by
UANISOHYPER_INV or
UANISOHYPER_STRAIN is incompressible.
Set TYPE=COMPRESSIBLE to indicate that the hyperelastic material defined by
UANISOHYPER_INV or
UANISOHYPER_STRAIN is compressible.
Optional parameters
- DEPENDENCIES
Set this parameter equal to the number of field variable dependencies
included in the definition of the anisotropic hyperelastic material properties.
If this parameter is omitted, it is assumed that the material properties are
constant or depend only on temperature. See
Specifying field variable dependence
for more information.
- LOCAL DIRECTIONS
This parameter can only be used in combination with an invariant-based
strain energy potential, such as HOLZAPFEL or USER, FORMULATION=INVARIANT. Set this parameter equal to the number of preferred local
directions (or fiber directions) in the material. The default is LOCAL DIRECTIONS=0.
When LOCAL DIRECTIONS=N, the definitions of the
N local direction vectors in the reference configuration
are specified using the
ORIENTATION, LOCAL DIRECTIONS=M option, with M ≥
N. If M > N,
the first N directions will be used.
If the HOLZAPFEL strain energy potential is used, at least one local direction
must be specified.
- MODULI
This parameter is applicable only when the
ANISOTROPIC HYPERELASTIC option is used in conjunction with the
VISCOELASTIC option.
Set MODULI=INSTANTANEOUS to indicate that the anisotropic hyperelastic material
constants define the instantaneous behavior. This parameter value is not
available for frequency domain viscoelasticity in an
Abaqus/Standard
analysis. This is the only option available if the anisotropic hyperelastic
potential is defined in a user subroutine.
Set MODULI=LONG TERM to indicate that the hyperelastic material constants define
the long-term behavior. This option is not available when a user subroutine is
used to define the anisotropic hyperelastic potential. It is the default for
all other anisotropic hyperelastic models.
- 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 subroutines
UANISOHYPER_INV and
UANISOHYPER_STRAIN in
Abaqus/Standard
or
VUANISOHYPER_INV and
VUANISOHYPER_STRAIN in
Abaqus/Explicit.
The default value is 0.
Data lines to define the material constants for the FUNG-ANISOTROPIC model
- First
line
.
.
.
.
.
.
.
.
- Second line
.
.
.
.
.
.
.
.
- Third line
.
.
.
.
.
.
(Units of FL−2.)
.
(Units of F−1L2.)
Temperature.
- Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than zero)
First 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 constants for the FUNG-ORTHOTROPIC model
- First
line
.
.
.
.
.
.
.
.
- Second line
.
.
(Units of FL−2.)
.
(Units of F−1L2.)
Temperature.
First field variable.
Etc., up to four field variables per line.
- 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 constants for the HOLZAPFEL model
- First
line
.
(Units of FL−2.)
.
(Units of F−1L2.)
.
(Units of FL−2.)
.
Fiber dispersion parameter
().
Temperature.
First field variable.
Second field variable.
- Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than two)
Third 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 for the USER anisotropic hyperelasticity model
- No data lines are needed if the PROPERTIES parameter is omitted or set to 0. Otherwise, first
line
Give the material properties, eight per line. If this option is used in
conjunction with the
VISCOELASTIC option, the material properties must define the
instantaneous behavior. If this option is used in conjunction with the
MULLINS EFFECT option, the material properties must define the primary
response.
Repeat this data line as often as necessary to define the
material properties.