WARNING [4054]: NEGATIVE JACOBIAN IN ELEMENT ID = #

Cause

This error is generated when the inverse matrices cannot be obtained during an analysis.  The primary reasons are as follows:

1. When an element shape is excessively twisted

2. When the node numbers are incorrectly sequenced

For linear analysis, such a problem is processed as an error since it is a modeling issue.  However, it is not considered as an error in nonlinear static analysis because it may occur while the calculation has not converged.  Especially when higher-order elements are used and the geometric model is complex, the error may be most likely generated due to the 1st reason.

Analysis Type

Linear analysis (linear static, modal)

Related Menu

Mesh >> Element >> Parameters >> 2D or 3D >> Change Element Order...

Mesh >> Element >> Modify...

Mesh >> Element >> Modify Topology >> Fix Connectivity of Reversed Solid...

Remedy

1. Identify and correct the excessively distorted elements.  In case higher-order elements are used, improve the shape of the mesh using the "Move Mid-Node to Center of Two Nodes" function under "Mesh >> Element >> Parameters >> 2D or 3D >> Change Element Order.

2. No errors are generated for node IDs automatically assigned by the mesh creation functions provided by the program.  Check the mesh generated by user-defined node IDs.  Once the troublesome mesh is identified, revise the corresponding elements using the "Mesh >> Element >> Modify" function.  Especially for solid element mesh, revise the error using the "Mesh >> Element >> Modify Topology >> Fix Connectivity of Reversed Solid" function.