ProductsAbaqus/StandardAbaqus/ExplicitAbaqus/CAE
TypeModel data LevelModel
Abaqus/CAEInteraction module
Optional parameters
- COMPONENT
-
Set this parameter equal to the connector's component of relative motion for
which damping behavior is specified. For this component of relative motion the
connector will act as a dashpot for TYPE=VISCOUS. Omit this parameter to define coupled behavior.
- TYPE
-
Set this parameter equal to VISCOUS (default) to specify velocity proportional damping.
Set this parameter equal to STRUCTURAL to specify displacement proportional damping. This setting
applies to the relevant analyses listed below.
In mode-based analyses both types apply to analyses that support nondiagonal
damping in
Abaqus/Standard.
Optional parameters for TYPE=VISCOUS
- DEPENDENCIES
-
Set this parameter equal to the number of field variable dependencies
included in the definition of the connector damping data, in addition to
temperature. If this parameter is omitted, it is assumed that the connector
damping is independent of field variables.
See Material Data Definition for more information.
- EXTRAPOLATION
-
Set EXTRAPOLATION=CONSTANT (default unless
CONNECTOR BEHAVIOR, EXTRAPOLATION=LINEAR is used) to use constant extrapolation of the dependent
variables outside the specified range of the independent variables.
Set EXTRAPOLATION=LINEAR to use linear extrapolation of the dependent variables outside
the specified range of the independent variables.
- FREQUENCY DEPENDENCE
-
This parameter is relevant only for coupled linear viscous damping
definitions in an
Abaqus/Standard
analysis. Use this parameter to define viscous damping terms with frequency
dependence.
Set FREQUENCY DEPENDENCE=OFF (default) if frequency dependence of the damping terms is not
defined.
Set FREQUENCY DEPENDENCE=ON if frequency dependence of the damping terms is defined.
- INDEPENDENT COMPONENTS
-
This parameter can be used only if the COMPONENT and NONLINEAR parameters are included.
Set INDEPENDENT COMPONENTS=POSITION (default) to specify dependencies on components of relative
position included in the damping definition.
Set INDEPENDENT COMPONENTS=CONSTITUTIVE MOTION to specify dependencies on components of constitutive relative
motion included in the damping definition.
If damping is dependent on only the relative velocity in the component
specified with the COMPONENT parameter, the INDEPENDENT COMPONENTS parameter should not be used.
- NONLINEAR
-
This parameter can be used only if the COMPONENT parameter is included.
Include this parameter to define nonlinear damping behavior. Omit this
parameter to define linear damping behavior.
- REGULARIZE
-
This parameter applies only to
Abaqus/Explicit
analyses.
Set REGULARIZE=ON (default unless
CONNECTOR BEHAVIOR, REGULARIZE=OFF is used) to regularize the user-defined tabular connector
damping data.
Set REGULARIZE=OFF to use the user-defined tabular connector damping data
directly without regularization.
- RTOL
-
This parameter applies only to
Abaqus/Explicit
analyses.
Set this parameter equal to the tolerance to be used to regularize the
connector damping data.
If this parameter is omitted, the default is RTOL=0.03 unless the tolerance is
specified on the
CONNECTOR BEHAVIOR option.
- UNSYMM
-
This parameter is relevant only for linear coupled viscous damping
definitions in an
Abaqus/Standard
analysis.
Include this parameter if the linear coupled viscous damping matrices are
not symmetric.
Data lines
to define linear uncoupled viscous damping behavior (TYPE=VISCOUS, COMPONENT with the NONLINEAR parameter omitted)
- First line
-
Damping coefficient (force or moment per relative velocity).
-
Leave blank in an
Abaqus/Explicit
analysis. In an
Abaqus/Standard
analysis this field corresponds to frequency (in cycles per time). Applicable
for
STEADY STATE DYNAMICS, DIRECT;
STEADY STATE DYNAMICS, SUBSPACE PROJECTION; and
STEADY STATE DYNAMICS and
MODAL DYNAMIC analyses that support nondiagonal damping.
-
Temperature.
-
First field variable.
-
Second field variable.
-
Etc., up to five field variables.
- Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than five)
-
Sixth field variable.
-
Etc., up to eight field variables per line.
Repeat this set of data lines as often as necessary to
define the damping coefficient as a function of frequency, temperature, and
other predefined field variables.
Data lines
to define linear coupled viscous damping behavior (TYPE=VISCOUS with the COMPONENT, NONLINEAR, and UNSYMM parameters omitted; all 21 damping constants must be specified,
regardless of whether temperature or field variable dependencies are
included)- First
line
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- Second line
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- Third line
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Temperature.
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First field variable.
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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 connector damping behavior as a function of temperature and other
predefined field variables.
Data lines
to define linear coupled viscous damping behavior with frequency dependence (TYPE=VISCOUS with the COMPONENT, NONLINEAR, and UNSYMM parameters omitted, and FREQUENCY DEPENDENCE=ON; all 21 damping constants must be specified, regardless of
whether frequency, temperature, or field variable dependencies are
included)- First
line
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- Second line
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- Third line
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Leave blank in an
Abaqus/Explicit
analysis. In an
Abaqus/Standard
analysis this field corresponds to frequency (in cycles per time). Applicable
for
STEADY STATE DYNAMICS, DIRECT;
STEADY STATE DYNAMICS, SUBSPACE PROJECTION; and
STEADY STATE DYNAMICS and
MODAL DYNAMIC analyses that support nondiagonal damping.
-
Temperature.
-
First field variable.
- Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than two)
-
Second field variable.
-
Etc., up to eight field variables per line.
Repeat this set of data lines as often as necessary to
define the connector damping behavior as a function of frequency, temperature,
and other predefined field variables.
Data lines
to define linear coupled viscous damping behavior using unsymmetric storage
(the COMPONENT and NONLINEAR parameters are omitted and UNSYMM is included; all 36 damping constants must be specified,
regardless of whether temperature or field variable dependencies are
included)- First
line
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- Second line
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- Third line
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- Fourth line
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- Fifth line
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Temperature.
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First field variable.
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Second field variable.
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Third field variable.
- Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than three)
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Fourth field variable.
-
Etc., up to eight field variables per line.
Repeat this set of data lines as often as necessary to
define the unsymmetric connector damping behavior as a function of temperature
and other predefined field variables.
Data lines
to define linear coupled viscous damping behavior using unsymmetric storage and
frequency dependence (the COMPONENT and NONLINEAR parameters are omitted, the UNSYMM parameter is included, and FREQUENCY DEPENDENCE=ON; all 36 damping constants must be specified, regardless of
whether frequency, temperature, or field variable dependencies are
included)- First
line
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(Units of FTL−1.)
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(Units of FTL−1.)
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(Units of FTL−1.)
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(Units of FT.)
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- Second line
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- Third line
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- Fourth line
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- Fifth line
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(Units of FT.)
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(Units of FTL.)
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(Units of FTL.)
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(Units of FTL.)
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Leave blank in an
Abaqus/Explicit
analysis. In an
Abaqus/Standard
analysis this field corresponds to frequency (in cycles per time). Applicable
for
STEADY STATE DYNAMICS, DIRECT;
STEADY STATE DYNAMICS, SUBSPACE PROJECTION; and
STEADY STATE DYNAMICS and
MODAL DYNAMIC analyses that support nondiagonal damping.
-
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 unsymmetric connector damping behavior as a function of frequency,
temperature, and other predefined field
variables.
Data lines
to define nonlinear viscous damping behavior that depends on the velocity in
the direction of the specified component of relative motion (TYPE=VISCOUS, COMPONENT, NONLINEAR with the INDEPENDENT COMPONENTS parameter omitted)
- First line
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Force or moment.
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Relative velocity.
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Temperature.
-
First field variable.
-
Second field variable.
-
Etc., up to five field variables.
- Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than five)
-
Sixth field variable.
-
Etc., up to eight field variables per line.
Repeat this set of data lines as often as necessary to
define the connector damping behavior as a function of temperature and other
predefined field variables.
Data lines
to define linear viscous damping behavior that depends on the relative
displacement, positions, or motions in several component directions (TYPE=VISCOUS, COMPONENT, NONLINEAR, INDEPENDENT COMPONENTS)- First
line
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First independent component number (1–6).
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Second independent component number (1–6).
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Etc., up to
entries (maximum six).
- Subsequent lines
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Force or moment in the direction specified by the COMPONENT parameter.
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Relative velocity in the direction specified by the COMPONENT parameter.
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Connector relative position or constitutive relative motion in the first
independent component identified on the first data line.
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Connector relative position or constitutive relative motion in the second
independent component identified on the first data line.
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Etc., up to
entries as identified on the first data line. If six independent components are
used and no temperature or field variable dependencies are specified, a blank
data line must be placed after this line.
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Temperature.
-
First field variable.
-
Second field variable.
- If the number of data entries exceeds the limit
of eight entries per line, continue the input on the next data line.
- Continuation line (if needed)
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Third field variable.
-
Etc., up to eight entries per line.
Do not repeat the first data line. Repeat the subsequent
data lines as often as necessary to define the damping behavior as a function
of connector relative (angular) velocity, position, or motion; temperature; and
other predefined field variables.
Data lines
to define linear, uncoupled structural damping behavior (TYPE=STRUCTURAL, COMPONENT)- First
line
-
Damping coefficient.
-
Frequency (in cycles per time). Applicable for
STEADY STATE DYNAMICS, DIRECT;
STEADY STATE DYNAMICS, SUBSPACE PROJECTION; and
STEADY STATE DYNAMICS and
MODAL DYNAMIC analyses that support nondiagonal damping.
Repeat this data line as often as necessary to define the
damping coefficient as a function of frequency.
Data lines
to define linear, coupled structural damping behavior (TYPE=STRUCTURAL with the COMPONENT parameter omitted)
- First line
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- Second line
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- Third line
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