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ANGLE SUBDIVISIONS
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This parameter applies only to Abaqus/Standard analyses.
This parameter is meaningful only when a second-order orientation
tensor is used to specify the orientation of the inclusions in the aggregate.
Set
this parameter equal to the number of angle increments used for the discretization of
the orientation space.
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CLOSURE
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This parameter is used to select the closure approximation to compute the orientation
distribution function using the second-order orientation tensor. This parameter is
meaningful only when a second-order orientation tensor is used to specify the
orientation of the inclusions in the aggregate.
Set
CLOSURE=FITTED
to use the orthotropic fitted (ORF) closure approximation.
Set
CLOSURE=HYBRID
(default) to use the hybrid closure approximation.
Set
CLOSURE=ORE
to use the orthotropic equivalent of the natural (ORE) closure approximation.
Set
CLOSURE=QUADRATIC
to use the quadratic closure approximation.
Set
CLOSURE=SMOOTH
to use the orthotropic smooth closure approximation.
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FORMULATION
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Set
FORMULATION=MT
(default) to use the Mori-Tanaka model as the homogenization method. This setting is
the only formulation available in Abaqus/Explicit.
Set
FORMULATION=VOIGT
to use the Voigt model as the homogenization method.
Set
FORMULATION=REUSS
to use the Reuss model as the homogenization method.
Set
FORMULATION=INVERSED MT
to use the inverse Mori-Tanaka model as the homogenization method.
Set
FORMULATION=BALANCED
to use the interpolative double inclusion model as the homogenization method.
Set
FORMULATION=CHAMIS
to use the Chamis model as the homogenization method.
Set
FORMULATION=CCA
to use the composite cylinder assemblage model as the homogenization method.
This parameter is ignored if the CONCENTRATION TENSOR option is
used in the same material definition.
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ISOTROPIZATION
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Set
ISOTROPIZATION=ALLISO
(default) to use the isotropic projection of the stiffness to compute the entire
concentration tensor. This setting is the only isotropization method available in Abaqus/Explicit.
Set
ISOTROPIZATION=E-ISO
to use the isotropic projection of the matrix stiffness to compute only the Eshelby
tensor part of the concentration tensor.
Set
ISOTROPIZATION=P-ISO
to use the isotropic projection of the matrix stiffness to compute only the Hill's
tensor part of the concentration tensor.
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ORIENTATION AVERAGING
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Set
ORIENTATION AVERAGING=DISCRETE
(default in Abaqus/Standard) to compute integrals numerically during homogenization calculations of composites
containing short fibers with specified fiber dispersion.
Set
ORIENTATION AVERAGING=DIRECT
(default in Abaqus/Explicit) to compute integrals directly during homogenization calculations of composites
containing short fibers with specified fiber dispersion.
ORIENTATION AVERAGING=DIRECT
can be used only when
UNIFORM MATRIX STRAIN=YES.
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UNIFORM MATRIX STRAIN
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This parameter is meaningful only for multiphase composites with multiple inclusions
or void constituents. See Multistep Homogenization.
Set
UNIFORM MATRIX STRAIN=NO
(default) to indicate that Voigt homogenization is performed between pseudo-grains in
the second homogenization step.
Set
UNIFORM MATRIX STRAIN=YES
to indicate that a direct Mori-Tanaka homogenization is used for the composite. This
approach assumes that the average strain in the matrix is uniform across all
pseudo-grains.
In Abaqus/Explicit the matrix strain is always assumed to be uniform across all pseudo-grains.