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Nastran CBEAMs Orientation warning msg

prasad.guduguntla.external
Hello
I got a warning message about the orientation of CBEAMs (Nastran 2019)
 *** USER WARNING MESSAGE 5487 (EBEMS)
    ORIENTATION VECTOR DEFINED FOR THE ELEMENT ID =47505366 IS NEARLY PARALLEL, IT MAY GIVE POOR RESULTS.
In the previous versions, Orientation vector collinear with the element axes - these leads to FATAL ERROR
What effect will have it on displacements and element forces?
 
Thanks in Advance
Prasad.
  • 0
    Prasad, as far as I can tell, it depends on how 'parallel' the vector is in relation to being 'perfectly' parallel. I ran a test with a 1 unit long cantilevered beam, and if the orientation vector is perfectly aligned (using <1.0, 0.0, 0.0 >), it gives the same warning message you saw, plus the following FATAL error:
     
     *** USER FATAL MESSAGE 2026 (EMG)
        ELEMENT        1 GEOMETRY YIELDS UNREASONABLE MATRIX.
     
    I found that as long as there was a slightly non-parallel vector, it would only give the warning message... It only gave the warning only when I used <1.0, 1.0E-12, 0.0> and gave the warning plus the fatal with <1.0, 1.0E-16, 0.0>.
     
    In all the warning only test cases, the results were identical. You would have to validate your own model before assuming the results are good.
     
    I tested as far back as v2010 with the same results.
  • 0
    No matter what the results are, it's a poor practice to define orientations that are close to parallel with the element. I don't know why anyone would want to...it would make it very difficult for another user to figure out if the orientations are defined correctly.
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