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Negative Jacobian
DEFORM uses the finite element method to solve problems of large deformation and AMG (Automatic Mesh Generator) to automatically provide an optimized remeshing capability. In most cases, the meshing and remeshing runs very smoothly. There are cases though, where a simulation will not continue due to a negative Jacobian (unacceptable mesh) at a step immediately after a remeshing operation. In most cases, these can be easily identified from one of the following areas:
3.  A closed forging lap will usually lead to this problem. Look at your progressions carefully and see is there is a small area where a lap has formed and closed. If such a lap is detected and you would like to continue the simulation, you may try to
Using the Surface Patch feature in the Preprocessor under Objects Geometry can be useful. Folds will appear as short red lines that do not appear to highlight a single element. Be sure to view the object from multiple angles before deciding that a red mark is a fold, because surface patches from the far side of the object can be misleading.
Modify the geometry to remove the lap, and continue the simulation. This will require remeshing and interpolation to maintain the strain, temperature and damage history
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