HD88016: ANALYSIS (GSA) / SINGULARITY IS DETECTED IF COMPATIBLE MODE IS SELECTED FOR CREATING A SPOT WELD PROPERTY.

APAR status

• Closed as Permanent restriction.

Error description

• SCENARIO:
  Operation:
  1.Open the attached CATAnalysis file.
  2.Change workbench to the Generative Structural Analysis W/B.
  3.Double click on the Spot Welding Connection Property in the
  Properties.1.
  4.Select the Beam as the Type.
  5.Click the Component edition button.
  6.Select the Cylindrical beam as the type.
  7.Click the Component edition button.
  8.Input the 1mm as the Radius.
  9.Click the OK button.
  10.Select the Point.1 in the SUR_B.CATPart as the Orientation
  geometry.
  11.Click the OK button.
  12.Click the OK button.
  13.Select the Clamp command.
  14.Select the edge of the SUR_B as shown in the attached
  image.
  15.Click the OK button.
  16.Select the Force Density command.
  17.Select the SUR_A.CATPart as the Support.
  18.Input the -1000N as the Z of the Force Vector.
  19.Click the OK button.
  20.Select the Compute All command.
  RESULT:
  An error occurs and the Compute is interrupted
  ADDITIONAL INFO:
  - This trouble also occurs when the Spring-Rigid-Spring or the
  Rigid-Spring-Rigid is selected as Step4
  - This trouble does NOT occur when the Non-Compatible is
  selected as the Mesh Compatibility.
  .
  EXPECTED RESULT:
  The Compute should be performed when the Compatible is setup.
  .
  

Local fix

Problem summary

• SCENARIO:
  Operation:
  1.Open the attached CATAnalysis file.
  2.Change workbench to the Generative Structural Analysis W/B.
  3.Double click on the Spot Welding Connection Property in the
  Properties.1.
  4.Select the Beam as the Type.
  5.Click the Component edition button.
  6.Select the Cylindrical beam as the type.
  7.Click the Component edition button.
  8.Input the 1mm as the Radius.
  9.Click the OK button.
  10.Select the Point.1 in the SUR_B.CATPart as the Orientation
  geometry.
  11.Click the OK button.
  12.Click the OK button.
  13.Select the Clamp command.
  14.Select the edge of the SUR_B as shown in the attached
  image.
  15.Click the OK button.
  16.Select the Force Density command.
  17.Select the SUR_A.CATPart as the Support.
  18.Input the -1000N as the Z of the Force Vector.
  19.Click the OK button.
  20.Select the Compute All command.
  RESULT:
  An error occurs and the Compute is interrupted
  ADDITIONAL INFO:
  - This trouble also occurs when the Spring-Rigid-Spring or the
  Rigid-Spring-Rigid is selected as Step4
  - This trouble does NOT occur when the Non-Compatible is
  selected as the Mesh Compatibility.
  .
  EXPECTED RESULT:
  The Compute should be performed when the Compatible is setup.
  .
  

Problem conclusion

• THIS PROBLEM IS PERMANENT RESTRICTION IN CATIA.
  Additional Closure Information:
  INCIDENT DIAGNOSIS:
  If Compatible mesh is used for spot weld connection,
  singularity error is shown.
  RESTRICTION EXPLANATION:
  - If Beam type of connection is used for weld with compatible
  mesh, the beam introduces stiffness in rotational direction.
  - Due to this beam stiffness in rotational direction, local
  rotational singularity is not detected.
  - However, the beam is still free to rotate about its axis.
  This is a global singularity and hence the singularity error
  is shown and model is not computed.
  - With non-compatible mesh, additional nodes are generated by
  orthogonal projection. There nodes have kinematic relations
  with their surrounding nodes.
  - Due to kinematic relations, there is no rotational
  singularity and model is computed.
  Due to this reason the current behavior can not be changed.
  .
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels