Use of smaller value for Precision singularity detection under Numerics.ĭo the following steps to resolve this error:.

Using Multfront or LDLT for non-positive-definite matrices (negative or zero eigenvalues) under Numerics.

Node belongs to multiple contact slave assignments.

Duplicated contact assignment on the same pair of faces, with reversed order of master/slave.

This causes the body to move freely in all directions which causes the matrix to become uninvertible.

A body is only constrained by its contact with another solid body when using linear sliding contacts or nonlinear physical contacts.

Units of material properties such as Young’s modulus are not consistent with the dimensions of the geometry.

Some nodes are overconstrained, due to multiple constraints assigned in the same direction from different boundary conditions, contacts, physical contacts, or a combination of those.

For example, applying only a load without constraining the geometry. An uninvertible matrix can be caused by poorly defined constraints. This error may occur due to several reasons, which are: The solution couldn’t proceed since the matrix is singular (not factorable matrix).

This might be caused by unconstrained rigid body motion or by overconstrained degrees of freedom due to multiple linear relations at at least one node.

Singular matrix