ERROR [2007]: FACTORIZATION FAILED DUE TO SINGULARITY AT # (NODE ID) (RANK=#)

Cause

This error is generated when matrix decomposition cannot progress any further due to the presence of singularities.  Such errors often occur when constraints to the analysis model are insufficient.

Analysis Type

All types of analyses except for explicit dynamic, nonlinear and mode-based analyses

Related Menu

Mesh >> Element >> Create >> Other >> Rigid Body...

Analysis >> Boundary >> Constraint...

Analysis >> Boundary >> Constraint Equation...

Analysis >> Contact >> Define Contact...

Remedy

This error is typically generated when the overall analysis model has been insufficiently constrained.  The following steps must be taken:

1. Add suitable constraints by adding SPC (Single-Point Constraint), MPC (Multi-Point Constraint) or rigid body elements in order to eliminate any singularities.

2. The error may be generated if contacts are not properly defined in the analysis model.  In this case, check if all the contact conditions between the parts have been defined, and also if the "Contact Tolerance" value has been defined to include the tolerance distances between the parts.

3. In case of elements that include DOFs associated with no stiffness, use the "AUTOSPC/Automatic Single-Point Constraint" option or other appropriate constraints to eliminate the singularities.