Flexible joint definition

@EDGE_NAME {EdgeName}
@COMMENTS {CommentText}


  1. A flexible joint consists of a set of concentrated springs and dampers that is associated with an edge, EdgeName, used for the representation of multibody systems.
  2. The geometry of the flexible joint is inherited from edge, EdgeName, which must have an associated triad, TriadName.
  3. The stiffness matrix, D* of the joint is defined in the flexible joint properties, FlxPropName. The 6 × 6 stiffness matrix is fully populated, allowing the modeling of the various rectilinear and torsional stiffnesses, as well as potential elastic couplings. These physical properties are defined with respect to the local triad, TriadName. Note that two flexible joints can not share the properties under the same name.
  4. It is possible to attach comments to the definition of the object; these comments have no effect on its definition.

Visualization parameters

Representation SYMBOL TRIAD
Point size THICK THICK
Table 1. Default visualization parameters for the beam element.
Default font type: TIMES_ROMAN_24, Default color: RED.

The appearance of flexible joints during the visualization phase of the analysis can be controlled by visualization parameters. The default values of the visualization parameters are summarized in table 1. If those default parameters are not adequate, suitable values can be specified by associating visualization parameters, VizPrmName, with the element.


  1. Sensors can be defined to extract information about flexible joints. The following SensorType and associated FrameName specifications are allowed for flexible joints: ACCELERATIONS_0, ACCELERATIONS_1, DISPLACEMENTS_0, DISPLACEMENTS_1, POSITIONS_0, POSITIONS_1, VELOCITIES_0, and VELOCITIES_1. (Default value: DISPLACEMENTS).
  2. No u value or v value are accepted for flexible joints.