I need to list the values of directionals cosinus of stress tensor (eignevector) for each element of my model.
I know how to plot an arrows to see the tensor, but I need to extract this info to a file in order to perform a fatigue calculation.
Thanks in advance!
I don't know of a way to get the principal direction cosines out of NX. We supported this in I-deas 20+ years ago. I have to admit this is an area that needs improvement in NX. The data is there, but I don't know how to let the user see it from the UI. Maybe there is a way to get to it programmatically with NX Open and the results access API.
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Thanks Mark for your sincerely response.
Now, I extract these values from tensor with an external calculation, so I will continue doing it like this.
Well, the data you need is there indeed, simply ask to print results in the *.F06 file using the NX NASTRAN Output request setting Output Medium=PRINT and you will get for each 3-D solid element the following output:
The explanation of each field is available in the NX NASTRAN manuals, all is there, as always!!:
The explanation for each mark is the following:
Here you are the typical plot you can see in NX AdvSim V10 using a TENSOR plot for a simply cantilever beam meshed with CHEXA 8-nodes solid elements:
In 2-D Shell CQUAD4 elements the NX NASTRAN solver computes & write in the *.F06 file (with & without the corner data) the maximum, minimum & shear principal stresses in both TOP & BOTTOM faces together with the angle in the element coordinate system.
The explanation of every mark is the following:
The typical output for Shell CQUAD4 elements written in the *.F06 is the following (only showing results at center of the element, but available at nodes as well, of course):
The tensor result plot in NX AdvSim V10 for Shell elements is similar to the above for Solid Elements, but for FEMAP V11 users I want to inform that they can plot the Maximum Principal Stress Angle at TOP & BOTTOM faces for Shell elements as well because is an output vector available for postprocessing, coming directly from the NX NASTRAN *.OP2 file, then if FEMAP can postprocess this value then NX Advsim can do it as well in a future release, this is an important postprocessing feature to implement in the software, OK?.
thanks for your great response!
But...this info can´t help me, because I need to extract vectors from 2D shell elements and nastran only shows the angle between principal stresses.
Next screenshoot is an example (ANSYS output) of the info what I need: