Screen Strength

[dkgpune]

Dear All,

Here is the scenario:

There is an expanded metal screen (steel G550) with diamond shaped openings. An example is at

http://www.dexmet.com/Expanded-Metals.html

I know the basic dimensions of such as screen LWD, SWD, SWO, LWO, thickness etc..

The question is if a given expanded screen can work for 1.2kN/sq.m pressure?

Effective span = 1.25 m, height is 1 m.

How to find this screen strength? Any formula, reference, calculator shall be very helpful.

Thanks,

-DKG

 

[desertfox]

Hi

Why not contact the manufacturer?

 

[CELinOttawa]

You need to know the precise size of the material, and the way in which it was produced. Not difficult, but it is non-trivial.

Desertfox has given you good advice; Contact the manufacturer, or at a minimum find a matching product in a catalogue and use 70% of that value as a check.

 

[dkgpune]

Thanks for your tips!

In this case i want to manufacture this. Existing manufacturer are not providing this info as such. Moreover, i would like to learn the physics/mechanics behind the calculations.

 

[tbuelna]

Since you know the pressure differential over a given screen area, you can calculate the total distributed force produced on your screen. But things get more complicated due to the complex structural load path from the center of the screen to the perimeter of the screen created by the mesh pattern. A good start would be to calculate the cross section area of the solid mesh at the perimeter of the screen, and then divide the pressure force on the grid by this area. This would give you a simple P/A shear stress in the perimeter of the screen.

If you want to make things more complicated you can include factors like stress concentrations at the sharp internal corners of the diamond mesh openings. Or you can consider the effects of structural stiffness and deflections on the stress levels produced at the fixed perimeter of the screen.

 

[dkgpune]

Thanks! I was working on similar lines and performed following calculations albeit highly conservative and crude approach...

What is the opinion of expert on this...how can i further improve it make them more credible and robust....

Appreciate your insights...