1D Non-linear Pretension Results

Alan Buehne
Alan Buehne New Altair Community Member
edited May 2022 in Community Q&A

I have a simple model of a bolted flange. I'm using CBEAM elements to represent the bolts and using a PTFORCE load to apply pretension to the bolts. The pretension is reacted by contact between the flange faces.

If I run the model as a linear static problem, it behaves like I would expect, but when I run it as a non-linear static problem, I am having some trouble accessing the internal element forces to verify that my preload is working as intended.

The non-linear model runs without errors, but when I load the results into HyperView (loading the *.fem as the model and the *.h3d as the results file with advanced math enabled), I don't get any results (the N/A below) when I request element force vectors.

image

If I changed the output request from TENSOR to DIRECT, I can plot the results as a contour, but in some instances it would be nice to have the vector displays (see below for an example where I ran it as a linear static model).

image

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Answers

  • Rumpa Chandaroy_22076
    Rumpa Chandaroy_22076 New Altair Community Member
    edited May 2022

    Hi Alan,

    Looks like you want to check the preloading forces in the bolts.

    When you have 1D or 3D pretension bolts in model, OS creates a *.secres file (ascii file), that gives the PRETENS force results. You can read that file in HyperGraph.

    (You can also request PRETBOLT option to get a *.pret file that shows the pretension forces/adjustments).

     

    Hope this is what you are looking for,.

    Thanks,

    Rumpa

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