Inaccurate FEA Results
The results look correct to me for your setup. I do not think your selection of the Constraints are correct. Two of the legs of this table should be free to slide on the floor so Fixed should be replaced with Frictionless. The maximum displacement for your configuration is 11.75mm, with Frictionless constraints it is 12.36mm. As you would expect, since the table leg, on one side, can slide on the floor, due to the flexing of the legs, you get a different maximum displacement. My model is attached.
John Hackney, Retired
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Update: After changing the fixed constraints to frictionless constraints, I am now getting failed results during the solving process.
Please note that I only changed "two" fixed constraints into frictionless constraints. You can take a look at my supplied model. You have to have two legs, on one side, with fixed constraints to keep the table in position. I would expect a failed solution if you change all the leg fixed constraints to frictionless.
John Hackney, Retired
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Sorry, your post came in as I was typing. Well in real life all legs will try and spread but in this simulation Fusion 360 cannot compute that condition. If two legs slide on the floor, you will get the same result. Think about it, if you put the table legs, on one side against the wall or some stop, the other two legs would just move as required.
John Hackney, Retired
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