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FATAL ERROR E5001: NON-POSITIVE DEFINITE DETECTED AT GRID 22952 COMPONENT 1

Experimenter
Experimenter

I am optimizing an I-beam with web hole cutouts. The analysis gives the fatal error "FATAL ERROR E5001: NON-POSITIVE DEFINITE DETECTED AT GRID 22952 COMPONENT 1"

 

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Please help me with a solution to run a complete analysis in NEI Nastran.

 

1 REPLY 1

Re: FATAL ERROR E5001: NON-POSITIVE DEFINITE DETECTED AT GRID 22952 COMPONENT 1

Gears Phenom Gears Phenom
Gears Phenom

You haven't shown enough information - also the error states GRID 22952 but you have actually located the element 22952 - Not the same thing.

You most likely have a mechanism and/or rigid body movement.

If you want a complete answer I would suggest uploading a BDF/DAT file or show more - ie. you have shown only one side of the beam constrained, if this is true you will have a mechanism and a fatal run - but we cant see any further constraints.

A quick way you can check is using BAILOUT PARAM or run a modal analysis and return the first 6 modes - if these are close to zero you have a constraint issue.

Also, I would use a washer or pad around the holes to provide a better mesh quality.