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Simulated displacement incorrect based on manual calculation

Question asked by Frank Schoenherr on Mar 7, 2016
Latest reply on Mar 7, 2016 by Frank Schoenherr

Der all,

 

I am working on a case study and I am required to design machine elements with a maximum displacement of 1/1000.

As a "proof of concept" i have taken a sheet metal and calculated the maximum expected force on its surface.

 

I need to determine the maximum span between beam members for a given sheet metal.

I have chosen a 5mm cold rolled sheet metal:

  • 5mm thick
  • 1220mm wide

To determine the vertical deflection, I need to obtain first the Second moment of inertia, which is Ix = (1220 x 5^3) / 12 = 12,708

To determinate now the deflection, I have used the following equation for equal distributed force:

y=(5 x F x L^3) / (384 x E x Ix) = (5 x 2.36kN x 200mm^3) / (384 x 200 x 12,708) = 0.097mm

 

To simulate the same I took SimulationXpress and created a part as described above and applied the same force to it.

However, when I create the report, the maximum displacement is not near the calculated value of 0.097mm, it is shown on page 7 with 0.021mm. I have attached the generated report for your reference.

 

Do you have any idea what I am missing?

 

Note: I am working with the current Student Edition.

 

Thank you, Frank

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