Export Element Stress

[FreeJBird]

How do I export element stress to a text file in NX8? The results file (*.op2) is a binary file and I do not see any docs on how to read it so I have been looking for a file->export->element stress option, but I have not found anything. I need the element stress in order to do some post-processing on the results. For example, plotting the Tsai-Hill failure criteria.

 

[FreeJBird]

I want all the components of the stress tensor at all elements. For example, I would want a table
Element ID XX YY ZZ XY XZ YZ
105 32.1 27.2 15.1 2.4 6.2 7.5
106 34.1 22.2 11.1 1.4 8.2 2.5
...