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The ABAQUS FAQ


26. ABAQUS - Errors

Q26.1 : In a 3-dimensional analysis using mixture of elements (CDR8, S4R5 and M3D4) degrees of freedom of M3D4 elements appear to get fixed where these are supposed to be free. Why is that?

The membrane elements do not have any stiffness in the normal direction. Unless stiffness contributions are made in this direction by the other element types this results in zero pivots. ABAQUS tries to fix these in order to able find a solution.
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Last updated: 18 December 2011