Nastran non linear analysis help

[Bharathsf]

Hi,
I want to solve an autoclave component in nastran using sol 106(Non linear static). I have modeled the component using Hex20 elements.But whenever I put it to solve, it will complete in about 5 seconds and the f06 file will be 0 bytes. But if I model using hex 8 elements, it is solving. So can anyone please tell me what might be the error?

Thanks

Bharat

 

[Bharathsf]

BTW, I modeled the component using Hypermesh 10, sorry I forgot to mention it in the question.

 

[BlasMolero]

Hello!,
Look for fatal word in the *.f06 nastran output file, there you will see the reason of the error.

For instance, if you run NX NASTRAN take in mind the following:
• Linear CHEXA 8-nodes: can be used for Nonlinear Elastic, Elasto- Plastic and Geometric Nonlinear Analysis – Small Strain Elements.
• Parabolid CHEXA 20-nodes: The higher order elements can be used only for Nonlinear Analysis — Fully Nonlinear (Finite Deformation) Hyperelastic Elements, including large strain and large rotation.

Best regards,
Blas.

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Ingeniero Industrial
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