ABAQUS Keywords Reference Manual  

*CONNECTOR DAMPING
Define connector damping behavior.

This option is used to define the damping behavior for connector elements.

Products: ABAQUS/Standard  ABAQUS/Explicit  

Type: Model data

Level: Model  

References:

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. Omit this parameter if coupled behavior is to be defined.

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 “Specifying field variable dependence” in “Material data definition,” Section 9.1.2 of the ABAQUS Analysis User's Manual, for more information.

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.

Data lines to define linear uncoupled damping behavior (the COMPONENT parameter is included and the NONLINEAR parameter is omitted): 

First line:

  1. Damping coefficient (force or moment per relative velocity).

  2. Leave blank in an ABAQUS/Explicit analysis. In an ABAQUS/Standard analysis this field corresponds to frequency (in cycles per time, for *STEADY STATE DYNAMICS, DIRECT and *STEADY STATE DYNAMICS, SUBSPACE PROJECTION analyses only).

  3. Temperature.

  4. First field variable.

  5. Second field variable.

  6. Etc., up to five field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than five):

  1. Sixth field variable.

  2. 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 damping behavior (the COMPONENT and NONLINEAR parameters are omitted; all 21 damping constants must be specified, regardless of whether temperature or field variable dependencies are included): 

First line:

  1. . (Units of FTL–1.)

  2. .

  3. .

  4. .

  5. .

  6. .

  7. . (Units of FT.)

  8. .

Second line:

  1. .

  2. . (Units of FTL.)

  3. . (Units of FT.)

  4. .

  5. .

  6. . (Units of FTL.)

  7. .

  8. . (Units of FT.)

Third line:

  1. .

  2. .

  3. . (Units of FTL.)

  4. .

  5. .

  6. Temperature.

  7. First field variable.

  8. Second field variable.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than two):

  1. Third field variable.

  2. 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 nonlinear damping behavior that depends on the velocity in the direction of the specified component of relative motion (the COMPONENT and NONLINEAR parameters are included and the INDEPENDENT COMPONENTS parameter is omitted): 

First line:

  1. Force or moment.

  2. Relative velocity.

  3. Temperature.

  4. First field variable.

  5. Second field variable.

  6. Etc., up to five field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than five):

  1. Sixth field variable.

  2. 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 nonlinear damping behavior that depends on the relative velocities, positions, or motions in several component directions (the COMPONENT, NONLINEAR, and INDEPENDENT COMPONENTS parameters are included): 

First line:

  1. First independent component number (1–6).

  2. Second independent component number (1–6).

  3. Etc., up to entries (maximum six).

Subsequent lines:

  1. Force or moment in the direction specified by the COMPONENT parameter.

  2. Relative velocity in the direction specified by the COMPONENT parameter.

  3. Connector relative position or constitutive relative motion in the first independent component identified on the first data line.

  4. Connector relative position or constitutive relative motion in the second independent component identified on the first data line.

  5. Etc., up to entries as identified on the first data line.

  6. Temperature.

  7. First field variable.

  8. Second field variable.

    9. 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):

  1. Third field variable.

  2. 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.