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Unrealistic stresses in "simple" analysis.

Question asked by Josh Barnett on Aug 1, 2018
Latest reply on Aug 3, 2018 by Ryan Dark

Good evening all,

 

I am trying to analyze a part, simulating wind pressure on a large surface.

 

I have an aluminum extrusion, which is attached to a foam board.

 

The aluminum has a hinge which attaches to another piece.

 

So, the hinge would be fixed and the rest of the part is free to move. I want to apply pressure to the board, and I am concerned about the aluminum hinge failing.

 

First issue, my mesh ratio is too high, and I'm not sure if it is causing the following issue.

 

I want to apply 30-40 psf to an 8'x8' board. Then trasfer the load onto the extrusion.

 

For example I applied a force of ~500lb (made it up), but this displacement is only .00106 inches.

 

The material is 6061-T6 and the thickness of that area is only 0.09"

 

So it seems to me it's incorrect.

 

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