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Negative values of NDIR ?!!

Negative values of NDIR ?!!

Negative values of NDIR ?!!

(OP)
Dear friends,

I am trying to get principal stresses via "vsprinc" inside a "VUSDFLD" subroutine, however while I run my model with the subroutine, I get this error:
"Utility routine VSPRINC does not support tensors with NDIR=-228454389 and NSHR=2046."
NDIR is the number direct stress components so it must not be negative!!
I have run the model without the subroutine and it gives me reasonable results.
Could anyone kindly guide me to solve this error?

Best Regards

Amin

RE: Negative values of NDIR ?!!

(OP)
Any ideas yet?

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