| E5009 | WARNING: E5009 | elemtype ELEMENT id IS NON-POSITIVE DEFINITE |
| Cause: | The specified element total stiffness (linear plus differential) in a prestress analysis is non-positive definite. An E5001 or E5004 fatal error may also occur during solution factorization or preconditioning. | |
| Action: | The prestress loading will cause the specified element to become unstable. The element properties should be checked. PARAM, BARDKMETHOD, TENSION may be used to remove differential stiffness for line elements in compression. | |
| Remarks: | See Autodesk Nastran Reference Guide, Section 5, Parameters, for more information on the BARDKMETHOD parameter. |