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ANSYS Modal Analysis Sandwich Beam

ANSYS Modal Analysis Sandwich Beam

ANSYS Modal Analysis Sandwich Beam

Hi Everyone,

I'm relatively new to ANSYS and I am trying to model the modal analysis of a sandwich beam.  I'm currently using a 2-D approach since the width of my beam is much smaller than the length (18" compared to 1").  

I've got the geometry and meshing down...but when I run the modal analysis I'm getting WAY to many natural frequencies.  

The analysis involves clamped-clamped conditions, which I have specified by making Ux and Uy at the end nodes equal zero.  For my geometry I basically have 3 rectangles that represent each layer of the sandwich beam, and used the "glue" command to glue them together.

Any help would be great as to why I received too many natural frequencies.  Or if anyone else has modeled sandwich structures.


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