I suspect the issue is in the material definition and not in the element selection.

To check it:

try using a common simple material like isotropic steel in a simple elastic simulation with the C310 elements. If TRIAX is calculated, then the problem is the material definition.

Dear Mr. Stasio,

Thank you for your response

I have checked with the material as suggested by you and again I am getting the same same warning.

"Output request triax is not available for the material for element type c3d10"

I had also tried with different element type but not getting the result.

Regards

Pavan

Hi the ouput item 'triax' is only available in conjunction with damage initiation model. so you should not choose this when define the filed output ~