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Wrong natural frequency for filament

Question asked by John Beach on Feb 26, 2015
Latest reply on Feb 27, 2015 by Mike Pogue

I've modelled a 1/2 inch long steel filament, with a diameter of .0004 inch. With simple fixed ends (rotation allowed) and using beam elements, Solidworks Simulation (SS) predicts a first natural frequency of about 1000 Hz.  The closed form solution from Roarke's structural book predicts about 60 Hz.  Using solid elements, and just 3 or 4 of them, SS predicts a first frequency of around 100 Hz.  Why does Simulation give such a wrong answer?  Or did I make a mistake?

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