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jo2ny
Posts: 82
Registered: ‎02-07-2012
Accepted Solution

Trapezoid plate sigma

170 Views, 1 Replies
12-17-2012 05:35 AM

Hello,

 

I'm geting some wired sigma values for this trapezoid plate.

 

In a real model this would be a wall of a structure. It would have a wind load assigned to it.

Here are the input informations for testing:

I modelled a 1x1 m trapezoid plate (in XZ global plane).

Mesh is at 0.1 m.

Suports are definded on the edges parallel to X. Both have rotation releases for X directions.

Load is uniform distributed = 35kN/m2.

 

Doing a simple hand calculation results in a Maximum Moment of 4.375 kNm, a 223.43 N/mm2 sigma, 

and a 0.7cm deflection.

Everything coresponds with the robot results except the sigma value which is skyhigh

 = 5537 MPa

 

What's going wrong?

Attached model with pictures.

 

Thanks in advance!

 

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Artur.Kosakowski
Posts: 4,623
Registered: ‎12-17-2010

Re: Trapezoid plate sigma

12-17-2012 06:03 AM in reply to: jo2ny

The definition of an orthotropic thickness allows for having the correct stiffness of the panel (internal forces, displacements) but mind that you do not define the real shape of the 'thickness' but the equivalent 'flat' rectangle instead. If you need stress distribution you should define the exact shape of the plate instead (e.g. by extruding the polyline).

 

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.



Artur Kosakowski
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